Python multiprocessing make re2 deterioration to native re

[Honesty-of-the-Cavernous-Tissue]

Thanks for your great work !

i wonder if re2 takes some extra cpu resource consume

in my project, i tested a single file of text processing for native re & re2 (with just only regex part different)
re2 is obvious faster

but when i used multiprocessing to process a group of data, with whole cpu resource usage, re2 was deterioration to native re

[rsc]

A concrete demonstration example that people can run would help here. In general RE2 works fine across multiple threads. Perhaps Python does not work as well with multiple threads.