Practical performance engineering: load testing, SRE, observability, and AI/LLM systems performance. Deep-dive guides plus free interactive calculators.https://perf-test.com/en-ushttps://perf-test.com/blog/measuring-llm-inference-performance/https://perf-test.com/blog/measuring-llm-inference-performance/The metrics that actually matter for LLM serving — TTFT, TPOT, tokens/sec, and cost per request — how they trade off, and how to load-test an inference endpoint.Tue, 23 Jun 2026 00:00:00 GMTai-performancellminferencelatencythroughputload-testinghttps://perf-test.com/blog/jmeter-installation-setup/https://perf-test.com/blog/jmeter-installation-setup/How to install Apache JMeter correctly, the JVM heap settings that matter, and the first configuration changes you should make before your first real test.Sat, 20 Jun 2026 00:00:00 GMTperformance-testingjmetersetupconfigurationhttps://perf-test.com/blog/jmeter-introduction/https://perf-test.com/blog/jmeter-introduction/What Apache JMeter is, why it's still the most widely used open-source load testing tool, and where it fits next to k6, Gatling, and LoadRunner.Sat, 20 Jun 2026 00:00:00 GMTperformance-testingjmeterload-testinggetting-startedhttps://perf-test.com/blog/jmeter-thread-groups-explained/https://perf-test.com/blog/jmeter-thread-groups-explained/How JMeter Thread Groups control virtual users, ramp-up time, and loop count, and how to choose values that actually model your real traffic pattern.Sat, 20 Jun 2026 00:00:00 GMTperformance-testingjmeterthread-groupsload-testinghttps://perf-test.com/blog/slos-and-error-budgets/https://perf-test.com/blog/slos-and-error-budgets/How to turn vague reliability goals into measurable SLIs, SLOs, and error budgets — and how that math directly governs release velocity and on-call load.Sat, 20 Jun 2026 00:00:00 GMTsresloslierror-budgetreliabilityhttps://perf-test.com/blog/jmeter-assertions-validating-responses/https://perf-test.com/blog/jmeter-assertions-validating-responses/How to use JMeter assertions to catch silent failures — wrong content, slow responses, and unexpected status codes — that a simple pass/fail check misses.Fri, 19 Jun 2026 00:00:00 GMTperformance-testingjmeterassertionsvalidationhttps://perf-test.com/blog/jmeter-http-sampler-deep-dive/https://perf-test.com/blog/jmeter-http-sampler-deep-dive/Every important setting on JMeter's HTTP Request sampler, from implementation choice to connection reuse, explained for accurate load testing.Fri, 19 Jun 2026 00:00:00 GMTperformance-testingjmeterhttpsamplershttps://perf-test.com/blog/jmeter-listeners-and-reporting/https://perf-test.com/blog/jmeter-listeners-and-reporting/Which JMeter listeners to use during scripting versus load generation, and how to produce a trustworthy HTML report from a non-GUI run.Fri, 19 Jun 2026 00:00:00 GMTperformance-testingjmeterlistenersreportinghttps://perf-test.com/blog/jmeter-correlation-dynamic-values/https://perf-test.com/blog/jmeter-correlation-dynamic-values/How to extract and reuse dynamic values like session tokens, CSRF tokens, and IDs in JMeter so recorded scripts work correctly under load.Thu, 18 Jun 2026 00:00:00 GMTperformance-testingjmetercorrelationscriptinghttps://perf-test.com/blog/jmeter-parameterization-csv-data/https://perf-test.com/blog/jmeter-parameterization-csv-data/How to drive JMeter test data from CSV files so virtual users don't all hammer the same account, search term, or product ID.Thu, 18 Jun 2026 00:00:00 GMTperformance-testingjmeterparameterizationtest-datahttps://perf-test.com/blog/jmeter-timers-pacing-think-time/https://perf-test.com/blog/jmeter-timers-pacing-think-time/The difference between JMeter's Constant Timer, Uniform Random Timer, and Constant Throughput Timer, and which one actually controls throughput.Thu, 18 Jun 2026 00:00:00 GMTperformance-testingjmetertimerspacinghttps://perf-test.com/blog/jmeter-distributed-load-testing/https://perf-test.com/blog/jmeter-distributed-load-testing/How JMeter's controller/agent (master/slave) distributed testing mode works, and what to check before trusting results from multiple load generators.Wed, 17 Jun 2026 00:00:00 GMTperformance-testingjmeterdistributed-testingscalinghttps://perf-test.com/blog/jmeter-logic-controllers/https://perf-test.com/blog/jmeter-logic-controllers/How JMeter's Logic Controllers (If Controller, Loop Controller, Transaction Controller) shape test flow and how to use them without breaking your results.Wed, 17 Jun 2026 00:00:00 GMTperformance-testingjmeterlogic-controllersscriptinghttps://perf-test.com/blog/jmeter-plugins-extending-functionality/https://perf-test.com/blog/jmeter-plugins-extending-functionality/An overview of the JMeter Plugins ecosystem — the Plugins Manager, the most widely used plugins, and how to install them safely.Wed, 17 Jun 2026 00:00:00 GMTperformance-testingjmeterpluginstoolinghttps://perf-test.com/blog/jmeter-best-practices-pitfalls/https://perf-test.com/blog/jmeter-best-practices-pitfalls/A checklist of JMeter mistakes that produce misleading results, and the practices experienced performance testers use to avoid them.Tue, 16 Jun 2026 00:00:00 GMTperformance-testingjmeterbest-practiceschecklisthttps://perf-test.com/blog/jmeter-html-dashboard-reports/https://perf-test.com/blog/jmeter-html-dashboard-reports/A guide to JMeter's generated HTML dashboard report — which graphs matter, which are easy to misread, and how to compare two runs properly.Tue, 16 Jun 2026 00:00:00 GMTperformance-testingjmeterreportinganalysishttps://perf-test.com/blog/jmeter-non-gui-mode-cicd/https://perf-test.com/blog/jmeter-non-gui-mode-cicd/How to run JMeter from the command line in a CI pipeline, fail builds on performance regressions, and avoid common automation pitfalls.Tue, 16 Jun 2026 00:00:00 GMTperformance-testingjmeterci-cdautomationhttps://perf-test.com/blog/jmeter-database-testing-jdbc/https://perf-test.com/blog/jmeter-database-testing-jdbc/How to load test a database directly with JMeter's JDBC Request sampler, including connection pooling configuration and common gotchas.Mon, 15 Jun 2026 00:00:00 GMTperformance-testingjmeterjdbcdatabasehttps://perf-test.com/blog/jmeter-groovy-scripting/https://perf-test.com/blog/jmeter-groovy-scripting/How to use JSR223 Groovy scripting in JMeter for custom logic that the built-in components can't express, with practical examples.Mon, 15 Jun 2026 00:00:00 GMTperformance-testingjmetergroovyscriptinghttps://perf-test.com/blog/jmeter-vs-k6-vs-gatling/https://perf-test.com/blog/jmeter-vs-k6-vs-gatling/A practical comparison of JMeter, k6, and Gatling across scripting model, protocol support, CI fit, and team skill requirements.Mon, 15 Jun 2026 00:00:00 GMTperformance-testingjmeterk6gatlingcomparisonhttps://perf-test.com/blog/jmeter-rest-api-testing/https://perf-test.com/blog/jmeter-rest-api-testing/A practical walkthrough of scripting a realistic REST API load test in JMeter, from authentication to JSON assertions to reporting.Sun, 14 Jun 2026 00:00:00 GMTperformance-testingjmeterrest-apitutorialhttps://perf-test.com/blog/jmeter-results-analysis-percentiles/https://perf-test.com/blog/jmeter-results-analysis-percentiles/How to properly analyze JMeter result data using percentiles instead of averages, with a worked example showing how averages hide real problems.Sun, 14 Jun 2026 00:00:00 GMTperformance-testingjmeteranalysispercentileshttps://perf-test.com/blog/jmeter-websocket-testing/https://perf-test.com/blog/jmeter-websocket-testing/How to load test WebSocket connections in JMeter using the WebSocket Samplers plugin, and what makes WebSocket load testing different from HTTP.Sun, 14 Jun 2026 00:00:00 GMTperformance-testingjmeterwebsocketreal-timehttps://perf-test.com/blog/loadrunner-architecture-vugen-controller-analysis/https://perf-test.com/blog/loadrunner-architecture-vugen-controller-analysis/A deeper look at how LoadRunner's three main components — VuGen, Controller, and Analysis — work together in a typical performance testing workflow.Sat, 13 Jun 2026 00:00:00 GMTperformance-testingloadrunnerarchitecturevugenhttps://perf-test.com/blog/loadrunner-introduction/https://perf-test.com/blog/loadrunner-introduction/What LoadRunner is, its core components (VuGen, Controller, Analysis), and where it fits in 2026 alongside open-source alternatives.Sat, 13 Jun 2026 00:00:00 GMTperformance-testingloadrunnergetting-startedperformance-testinghttps://perf-test.com/blog/loadrunner-recording-first-script-vugen/https://perf-test.com/blog/loadrunner-recording-first-script-vugen/A step-by-step guide to recording, replaying, and validating your first LoadRunner VuGen script.Sat, 13 Jun 2026 00:00:00 GMTperformance-testingloadrunnervugentutorialhttps://perf-test.com/blog/loadrunner-correlation-techniques/https://perf-test.com/blog/loadrunner-correlation-techniques/How to correlate dynamic values in LoadRunner scripts using the Correlation Studio, manual web_reg_save_param, and best practices for reliable scripts.Fri, 12 Jun 2026 00:00:00 GMTperformance-testingloadrunnercorrelationscriptinghttps://perf-test.com/blog/loadrunner-parameterization/https://perf-test.com/blog/loadrunner-parameterization/How to parameterize LoadRunner VuGen scripts to avoid testing with hardcoded, repeated data, including parameter types and data allocation strategies.Fri, 12 Jun 2026 00:00:00 GMTperformance-testingloadrunnerparameterizationtest-datahttps://perf-test.com/blog/loadrunner-protocols-choosing-right-one/https://perf-test.com/blog/loadrunner-protocols-choosing-right-one/How to choose the correct LoadRunner protocol for web, Citrix, SAP, and other application types, and why this decision matters more than in open-source tools.Fri, 12 Jun 2026 00:00:00 GMTperformance-testingloadrunnerprotocolsvugenhttps://perf-test.com/blog/loadrunner-analysis-reading-graphs/https://perf-test.com/blog/loadrunner-analysis-reading-graphs/A guide to the most useful graphs in LoadRunner Analysis — transaction response time, throughput, and Vuser status — and how to merge them for real insight.Thu, 11 Jun 2026 00:00:00 GMTperformance-testingloadrunneranalysisreportinghttps://perf-test.com/blog/loadrunner-controller-scenario-design/https://perf-test.com/blog/loadrunner-controller-scenario-design/How to design a LoadRunner Controller scenario, including Vuser groups, scheduling, and load generator assignment.Thu, 11 Jun 2026 00:00:00 GMTperformance-testingloadrunnercontrollerscenario-designhttps://perf-test.com/blog/loadrunner-rendezvous-points-pacing/https://perf-test.com/blog/loadrunner-rendezvous-points-pacing/How LoadRunner Rendezvous Points create synchronized concurrency spikes, and how Pacing controls iteration timing — two commonly confused concepts.Thu, 11 Jun 2026 00:00:00 GMTperformance-testingloadrunnerpacingrendezvoushttps://perf-test.com/blog/loadrunner-functions-custom-c-code/https://perf-test.com/blog/loadrunner-functions-custom-c-code/How to extend LoadRunner scripts with custom C code and the lr_* runtime API for logic the recorder and built-in functions can't express.Wed, 10 Jun 2026 00:00:00 GMTperformance-testingloadrunnerc-scriptingcustomizationhttps://perf-test.com/blog/loadrunner-online-monitor-integration/https://perf-test.com/blog/loadrunner-online-monitor-integration/How to correlate LoadRunner test results with server-side and APM monitoring data to find the real cause of performance regressions.Wed, 10 Jun 2026 00:00:00 GMTperformance-testingloadrunnermonitoringapmhttps://perf-test.com/blog/loadrunner-vs-modern-tools/https://perf-test.com/blog/loadrunner-vs-modern-tools/A practical framework for deciding when LoadRunner is the right choice in 2026 versus open-source alternatives like k6, JMeter, and Gatling.Wed, 10 Jun 2026 00:00:00 GMTperformance-testingloadrunnercomparisontool-selectionhttps://perf-test.com/blog/k6-getting-started/https://perf-test.com/blog/k6-getting-started/An introduction to k6, Grafana's open-source load testing tool, and why its code-first JavaScript scripting model fits modern CI/CD workflows.Tue, 09 Jun 2026 00:00:00 GMTperformance-testingk6getting-startedjavascripthttps://perf-test.com/blog/k6-scenarios-and-executors/https://perf-test.com/blog/k6-scenarios-and-executors/How k6's scenarios and executors let you model open-system arrival-rate traffic and closed-system concurrent-user traffic precisely.Tue, 09 Jun 2026 00:00:00 GMTperformance-testingk6scenariosload-modelinghttps://perf-test.com/blog/k6-thresholds-and-checks/https://perf-test.com/blog/k6-thresholds-and-checks/How k6 thresholds turn performance budgets into automated pass/fail criteria for CI, and how they differ from checks.Tue, 09 Jun 2026 00:00:00 GMTperformance-testingk6thresholdsci-cdhttps://perf-test.com/blog/gatling-introduction/https://perf-test.com/blog/gatling-introduction/What Gatling is, its Scala/Java DSL approach to scripting, and where it fits for JVM-comfortable teams doing serious load testing.Mon, 08 Jun 2026 00:00:00 GMTperformance-testinggatlinggetting-startedscalahttps://perf-test.com/blog/k6-cloud-ci-integration/https://perf-test.com/blog/k6-cloud-ci-integration/How to integrate k6 into a CI/CD pipeline, and when k6 Cloud's distributed execution is worth it over self-hosted runs.Mon, 08 Jun 2026 00:00:00 GMTperformance-testingk6ci-cdcloudhttps://perf-test.com/blog/k6-extensions-xk6/https://perf-test.com/blog/k6-extensions-xk6/How xk6 lets you build custom k6 binaries with extended protocol support and functionality beyond what's built in.Mon, 08 Jun 2026 00:00:00 GMTperformance-testingk6xk6extensionshttps://perf-test.com/blog/gatling-assertions-reports/https://perf-test.com/blog/gatling-assertions-reports/How Gatling's global and per-request assertions provide CI-friendly pass/fail criteria, and how to read its generated HTML reports.Sun, 07 Jun 2026 00:00:00 GMTperformance-testinggatlingassertionsreportinghttps://perf-test.com/blog/gatling-simulation-dsl-injection-profiles/https://perf-test.com/blog/gatling-simulation-dsl-injection-profiles/How Gatling's injection profiles (rampUsers, constantUsersPerSec, and more) model different load shapes, and how to choose the right one.Sun, 07 Jun 2026 00:00:00 GMTperformance-testinggatlingsimulationsload-modelinghttps://perf-test.com/blog/locust-introduction-python-load-testing/https://perf-test.com/blog/locust-introduction-python-load-testing/What Locust is, how its Python-based, code-first approach compares to k6 and Gatling, and when it's the right choice for your team.Sun, 07 Jun 2026 00:00:00 GMTperformance-testinglocustgetting-startedpythonhttps://perf-test.com/blog/chaos-engineering-intro/https://perf-test.com/blog/chaos-engineering-intro/What chaos engineering is, how to run a safe first experiment, and how it connects to error budgets and SLOs.Sat, 06 Jun 2026 00:00:00 GMTsrechaos-engineeringsrereliabilityhttps://perf-test.com/blog/locust-distributed-testing/https://perf-test.com/blog/locust-distributed-testing/How to run Locust in distributed mode across multiple machines, and the practical considerations for scaling beyond a single node.Sat, 06 Jun 2026 00:00:00 GMTperformance-testinglocustdistributed-testingscalinghttps://perf-test.com/blog/neoload-introduction/https://perf-test.com/blog/neoload-introduction/What NeoLoad is, its Design Studio and Controller-based workflow, and where it sits between LoadRunner and open-source tools.Sat, 06 Jun 2026 00:00:00 GMTperformance-testingneoloadgetting-startedperformance-testinghttps://perf-test.com/blog/capacity-planning-universal-scalability-law/https://perf-test.com/blog/capacity-planning-universal-scalability-law/How the Universal Scalability Law models contention and coherency penalties to predict where a system's throughput will actually peak and decline.Fri, 05 Jun 2026 00:00:00 GMTsrecapacity-planningscalabilityconceptshttps://perf-test.com/blog/incident-response-runbooks/https://perf-test.com/blog/incident-response-runbooks/What makes an incident runbook useful under real pressure versus one that gets ignored, with a practical structure to follow.Fri, 05 Jun 2026 00:00:00 GMTsreincident-responserunbookssrehttps://perf-test.com/blog/oncall-best-practices/https://perf-test.com/blog/oncall-best-practices/Practical on-call practices — rotation design, alert quality, and post-incident follow-up — that keep on-call sustainable rather than dreaded.Fri, 05 Jun 2026 00:00:00 GMTsreon-callsreteam-healthhttps://perf-test.com/blog/postmortem-culture/https://perf-test.com/blog/postmortem-culture/What separates a blameless postmortem culture that actually works from one that's blameless only in name, and how to build the former.Thu, 04 Jun 2026 00:00:00 GMTsrepostmortemsincident-responseculturehttps://perf-test.com/blog/sre-vs-devops-vs-platform-engineering/https://perf-test.com/blog/sre-vs-devops-vs-platform-engineering/A clear-eyed comparison of SRE, DevOps, and platform engineering as organizational approaches, and where the real differences (and overlaps) lie.Thu, 04 Jun 2026 00:00:00 GMTsresredevopsplatform-engineeringhttps://perf-test.com/blog/toil-reduction-automation/https://perf-test.com/blog/toil-reduction-automation/What SRE means by 'toil,' how to identify it systematically, and a practical framework for deciding what to automate first.Thu, 04 Jun 2026 00:00:00 GMTsretoilautomationsrehttps://perf-test.com/blog/monitoring-vs-observability/https://perf-test.com/blog/monitoring-vs-observability/What actually separates monitoring from observability beyond the buzzword, and why the distinction matters for debugging unknown failure modes.Wed, 03 Jun 2026 00:00:00 GMTsremonitoringobservabilitysrehttps://perf-test.com/blog/runbooks-vs-playbooks/https://perf-test.com/blog/runbooks-vs-playbooks/The practical difference between an incident runbook and a playbook, and when each is the right tool to write and maintain.Wed, 03 Jun 2026 00:00:00 GMTsrerunbooksplaybooksincident-responsehttps://perf-test.com/blog/sre-team-topologies/https://perf-test.com/blog/sre-team-topologies/How SRE teams are typically organized — embedded, centralized, and hybrid models — and the trade-offs each makes between context and consistency.Wed, 03 Jun 2026 00:00:00 GMTsresreteam-structureorganizationhttps://perf-test.com/blog/continuous-batching-llm-serving/https://perf-test.com/blog/continuous-batching-llm-serving/How continuous batching differs from static batching, why it's central to vLLM and TGI's throughput advantage, and what it costs individual requests.Tue, 02 Jun 2026 00:00:00 GMTai-performancellminferencebatchingvllmhttps://perf-test.com/blog/prompt-caching-kv-cache/https://perf-test.com/blog/prompt-caching-kv-cache/How prompt/KV caching reduces cost and latency for repeated context in LLM applications, and when it actually helps versus doesn't.Tue, 02 Jun 2026 00:00:00 GMTai-performancellmcachingkv-cachecosthttps://perf-test.com/blog/vector-database-performance-benchmarking/https://perf-test.com/blog/vector-database-performance-benchmarking/What actually matters when benchmarking a vector database for retrieval-augmented generation — recall, latency, and indexing trade-offs.Tue, 02 Jun 2026 00:00:00 GMTai-performancevector-databaseragbenchmarkinghttps://perf-test.com/blog/gpu-utilization-model-serving/https://perf-test.com/blog/gpu-utilization-model-serving/Why GPU utilization percentage alone is a misleading metric for LLM serving, and what to measure instead to understand real efficiency.Mon, 01 Jun 2026 00:00:00 GMTai-performancegpumodel-servingperformancehttps://perf-test.com/blog/quantization-performance-tradeoffs/https://perf-test.com/blog/quantization-performance-tradeoffs/How model quantization (INT8, INT4, and similar) trades accuracy for latency, throughput, and memory savings, and how to evaluate the trade-off.Mon, 01 Jun 2026 00:00:00 GMTai-performancequantizationllmperformancehttps://perf-test.com/blog/rag-latency-optimization/https://perf-test.com/blog/rag-latency-optimization/A breakdown of where latency accumulates in a retrieval-augmented generation pipeline, and the highest-leverage places to optimize it.Mon, 01 Jun 2026 00:00:00 GMTai-performanceraglatencyoptimizationhttps://perf-test.com/blog/benchmarking-open-source-llm-servers/https://perf-test.com/blog/benchmarking-open-source-llm-servers/A practical comparison framework for benchmarking vLLM, TGI, and Ollama, and what each is actually optimized for.Sun, 31 May 2026 00:00:00 GMTai-performancevllmtgiollamabenchmarkinghttps://perf-test.com/blog/load-testing-llm-apis/https://perf-test.com/blog/load-testing-llm-apis/How to design a load test specifically for LLM APIs, covering realistic prompt distributions, streaming measurement, and concurrency sweeps.Sun, 31 May 2026 00:00:00 GMTai-performancellmload-testingk6https://perf-test.com/blog/token-economics-101/https://perf-test.com/blog/token-economics-101/How LLM API pricing actually works — input vs output token pricing, why output costs more, and the practical levers for controlling cost.Sun, 31 May 2026 00:00:00 GMTai-performancellmcosttokenshttps://perf-test.com/blog/opentelemetry-getting-started/https://perf-test.com/blog/opentelemetry-getting-started/A practical introduction to OpenTelemetry's traces, metrics, and logs, and how to instrument a service for meaningful performance analysis.Sat, 30 May 2026 00:00:00 GMTobservabilityopentelemetryobservabilityinstrumentationhttps://perf-test.com/blog/prometheus-grafana-basics/https://perf-test.com/blog/prometheus-grafana-basics/How Prometheus's pull-based metrics model and PromQL work, and how to build Grafana dashboards that actually answer performance questions.Sat, 30 May 2026 00:00:00 GMTobservabilityprometheusgrafanametricshttps://perf-test.com/blog/the-red-method/https://perf-test.com/blog/the-red-method/How the RED method gives a simple, consistent framework for monitoring any request-driven service, and how it complements the USE method.Sat, 30 May 2026 00:00:00 GMTobservabilityred-methodmonitoringsrehttps://perf-test.com/blog/distributed-tracing-explained/https://perf-test.com/blog/distributed-tracing-explained/How distributed tracing actually works under the hood — spans, trace context propagation, and sampling strategies — explained from first principles.Fri, 29 May 2026 00:00:00 GMTobservabilitydistributed-tracingobservabilitymicroserviceshttps://perf-test.com/blog/structured-logging-best-practices/https://perf-test.com/blog/structured-logging-best-practices/Why structured logging (key-value fields, not free text) matters for debugging at scale, and practical conventions worth adopting.Fri, 29 May 2026 00:00:00 GMTobservabilityloggingstructured-loggingbest-practiceshttps://perf-test.com/blog/the-use-method/https://perf-test.com/blog/the-use-method/How Brendan Gregg's USE method systematically checks system resources for performance bottlenecks, and how it pairs with the RED method.Fri, 29 May 2026 00:00:00 GMTobservabilityuse-methodmonitoringperformancehttps://perf-test.com/blog/apm-tool-comparison/https://perf-test.com/blog/apm-tool-comparison/A practical comparison of how Datadog, Dynatrace, and New Relic approach instrumentation, AI-assisted root-cause analysis, and pricing.Thu, 28 May 2026 00:00:00 GMTobservabilityapmdatadogdynatracenew-relichttps://perf-test.com/blog/building-slo-dashboards/https://perf-test.com/blog/building-slo-dashboards/How to design an SLO dashboard that actually informs the ship/freeze decisions error budgets are meant to enable, not just display pretty graphs.Thu, 28 May 2026 00:00:00 GMTobservabilityslodashboardsgrafanahttps://perf-test.com/blog/littles-law-for-performance-engineers/https://perf-test.com/blog/littles-law-for-performance-engineers/An intuitive explanation of Little's Law (L = λW), how to derive concurrency, throughput, or latency from the other two, and common misuses.Thu, 28 May 2026 00:00:00 GMTconceptslittles-lawqueueing-theoryconceptshttps://perf-test.com/blog/amdahls-law-for-performance-engineers/https://perf-test.com/blog/amdahls-law-for-performance-engineers/How Amdahl's Law quantifies the limit parallelization can achieve when part of a workload is inherently serial, with practical examples.Wed, 27 May 2026 00:00:00 GMTconceptsamdahls-lawparallelismconceptshttps://perf-test.com/blog/queueing-theory-basics/https://perf-test.com/blog/queueing-theory-basics/An accessible introduction to queueing theory concepts — utilization, queue length, and waiting time — and why systems get dramatically slower near full utilization.Wed, 27 May 2026 00:00:00 GMTconceptsqueueing-theoryconceptscapacity-planninghttps://perf-test.com/blog/understanding-percentiles-p50-p95-p99/https://perf-test.com/blog/understanding-percentiles-p50-p95-p99/What latency percentiles actually mean, why averages systematically mislead, and the pitfalls of averaging or combining percentiles incorrectly.Wed, 27 May 2026 00:00:00 GMTconceptspercentileslatencyconceptshttps://perf-test.com/blog/concurrency-vs-parallelism/https://perf-test.com/blog/concurrency-vs-parallelism/The genuine technical distinction between concurrency and parallelism, why it matters for performance reasoning, and common confusions.Tue, 26 May 2026 00:00:00 GMTconceptsconcurrencyparallelismconceptshttps://perf-test.com/blog/gc-tuning-fundamentals/https://perf-test.com/blog/gc-tuning-fundamentals/The core concepts behind garbage collector tuning — generational collection, pause times, and throughput trade-offs — applicable across JVM, .NET, and Go.Tue, 26 May 2026 00:00:00 GMTconceptsgarbage-collectionjvmperformance-tuninghttps://perf-test.com/blog/throughput-vs-latency-tradeoffs/https://perf-test.com/blog/throughput-vs-latency-tradeoffs/Why throughput and latency often trade off against each other through batching, and how to decide where to sit on that trade-off curve.Tue, 26 May 2026 00:00:00 GMTconceptsthroughputlatencyconceptshttps://perf-test.com/blog/performance-budgets-for-web-applications/https://perf-test.com/blog/performance-budgets-for-web-applications/How to set practical performance budgets (page weight, load time, Core Web Vitals) and enforce them in CI before they regress in production.Mon, 25 May 2026 00:00:00 GMTperformance-testingperformance-budgetsweb-performanceci-cdhttps://perf-test.com/blog/synthetic-monitoring-vs-real-user-monitoring/https://perf-test.com/blog/synthetic-monitoring-vs-real-user-monitoring/How synthetic monitoring and real user monitoring complement each other for understanding production performance, and when to rely on each.Mon, 25 May 2026 00:00:00 GMTobservabilitysynthetic-monitoringrumobservabilityhttps://perf-test.com/blog/spike-testing-vs-stress-testing-vs-soak-testing/https://perf-test.com/blog/spike-testing-vs-stress-testing-vs-soak-testing/How spike testing, stress testing, and soak testing each answer a different reliability question, and why a single load test can't cover all three.Mon, 25 May 2026 00:00:00 GMTperformance-testingperformance-testingtest-typesconceptshttps://perf-test.com/blog/how-to-write-a-performance-test-plan/https://perf-test.com/blog/how-to-write-a-performance-test-plan/A practical template for a performance test plan that starts from a specific question, not a generic checklist of tools and metrics.Sun, 24 May 2026 00:00:00 GMTperformance-testingtest-planningbest-practicesperformance-testinghttps://perf-test.com/blog/performance-testing-checklist/https://perf-test.com/blog/performance-testing-checklist/A practical checklist to run through before considering a performance testing effort complete and ready to inform a launch decision.Sun, 24 May 2026 00:00:00 GMTperformance-testingchecklistperformance-testinglaunch-readinesshttps://perf-test.com/blog/top-performance-testing-mistakes/https://perf-test.com/blog/top-performance-testing-mistakes/A roundup of the most common, costly performance testing mistakes across tools and teams, distilled into a practical avoidance guide.Sun, 24 May 2026 00:00:00 GMTperformance-testingbest-practicesperformance-testingmistakeshttps://perf-test.com/blog/apdex-calculator-and-user-satisfaction/https://perf-test.com/blog/apdex-calculator-and-user-satisfaction/What the Apdex score actually measures, how to set its thresholds meaningfully, and its limitations as a single summary metric.Sat, 23 May 2026 00:00:00 GMTconceptsapdexuser-experienceconceptshttps://perf-test.com/blog/error-budgets-calculator-explained/https://perf-test.com/blog/error-budgets-calculator-explained/A step-by-step walkthrough of calculating an error budget from an SLO, with worked examples at different reliability targets.Sat, 23 May 2026 00:00:00 GMTsreerror-budgetslosrehttps://perf-test.com/blog/what-is-devperfops/https://perf-test.com/blog/what-is-devperfops/DevPerfOps extends DevOps by embedding performance engineering across the entire delivery pipeline — shifting it left from a pre-release gate to a continuous, shared responsibility.Thu, 28 Dec 2023 00:00:00 GMTconceptsdevperfopsdevopsshift-leftci-cd