Profilers lie all the time. Usually it's not so much a bug, as a known limitation of the profiling approach. E.g. profilers that annotate methods with entry / e

Profilers lie all the time. Usually it's not so much a bug, as a known limitation of the profiling approach. E.g. profilers that annotate methods with entry / exit code, inflate the runtime of small methods. Profiles that rely on CPU sampling, can be vulnerable to correlations with the sampling schedule. And so forth. The moral is to always do a reality check on whatever your profiler is telling you.