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Test & PolishToolOpen sourceFree
Very Sleepy
An open CPU sampling profiler that attaches to processes, reads symbols, and shows call trees and source locations.
Visit official siteContent updated Aug 1, 2026Automated check reached the official site · Checked Aug 24, 2026
Why use it
It provides a first hotspot pass on development builds without instrumentation rebuilds.
Where it fits
Use testing, performance, accessibility, and diagnostic tools to remove problems players will notice.
performancedebugging
What to check
It is Windows-focused and traditional; use specialized tools for modern async jobs, GPUs, and advanced ETW analysis.