Generate a CPU profile with go test -cpuprofile and analyze it using go tool pprof to identify performance bottlenecks.
Analyze Go CPU profiles by generating a .pprof file with go tool pprof and inspecting the top functions and call graph.
go test -cpuprofile=cpu.out ./...
pprof -top cpu.out
pprof -web cpu.out
The -top flag lists functions by CPU time, while -web generates an interactive SVG call graph.
CPU profiling records which parts of your Go program consume the most processor time. You run your program with a profiler attached, save the results to a file, and then use a tool to visualize the data. Think of it like a heat map that shows exactly where your code is working the hardest so you can optimize those specific areas.