Flamegraphs Find It. Replay Proves It.
Use Grafana Pyroscope and proxymock with an AI coding agent to find a Go CPU hotspot, preserve API behavior, and verify the performance fix.
Posts about performance testing
Browse 10 posts in this category
The API tests passed. The database didn't.
Our v2 release looked clean in HTTP tests until we diffed the SQL workload — an N+1 loop, a startup migration, and 70 ms of extra DB time hiding in plain sight. Here's how to compare two releases without database access.
The DIY Traffic Replay Trap: Why AI Scripts Fail at Scale
AI-generated scripts seem like a quick win, but DIY traffic replay tools become a maintenance nightmare at scale. Here's why Speedscale beats the prompt.
DLP, Traffic Replay, and the Missing Link to Software Quality
DLP applied to production traffic enables safe observability and realistic traffic replay, closing the gap between testing and production for faster.
The Ultimate Stress Test: Kim Jong Un, a Parachute, and a Multi-Billion Dollar Prop Bet
From memes to market meltdowns: Explore how a multi-billion dollar Super Bowl prop bet involving Kim Jong Un pushed prediction markets and SRE teams to.
The CES Hangover: 3 Expensive Hardware Fails That Were Actually Software Problems
Stop letting third-party API spikes crash your app. Learn why mocking latency for OpenAI, Anthropic.
Kubernetes Load Testing Made Easy with Speedscale
See how to get visibility into your Kubernetes workloads and run realistic load tests without writing YAML files or kubectl commands.
Shopify Outage 2025: Rise of the Commerce Kaiju
Shopify's infrastructure crumbled in 2025 like a city under a 'Commerce Kaiju' attack.
Cascading Failures Aren’t Inevitable: Lessons from the AWS DNS Outage
The AWS DNS outage exposed the risk of cascading failures. Learn how to prevent a single DNS failure from taking down your system by mapping service.