It is a multithreading profiling technique called causal profiling. The idea is by slowing everything else down running concurrently with a region of code, you

It is a multithreading profiling technique called causal profiling. The idea is by slowing everything else down running concurrently with a region of code, you can infer what the effect would be of speeding up that code. http://anthonylloyd.github.io/blog/2019/10/11/causal-profiling http://anthonylloyd.github.io/blog/2019/10/11/causal-profili...