Hi @<1671689458606411776:profile|StormySeaturtle98> ! Do you have a sample snippet that could help us diagnose this problem?

It seems that running Task.init() outside in the main process before spawning multiple processes, and calling Task.current_task() inside the rank = 0 process works with no slowdown

Hi Eugen
Thanks for the response!
let me know if you need a running example, that will require some effort to produce.

It just puzzles me that if a single subprocess spawns a task, meaning that only one task is active, and that task is only accessed by the worker creating it, the massive slowdown happens

That makes sense. You should generally have only 1 task (initialized in the master process). The other subprocesses will inherit this task which should speed up the process