Comment by BiteCode_dev

HTTP range strikes again.

As for 20 ms, if you deal with 20 dependencies in parallel, that's 400ms just to start working.

Shaving half a second on many things make things fast.

Althought as we saw with zeeek in the other comment, you likely don't need multiprocessing since the network stack and unzip in the stdlib release the gil.

Threads are cheaper.

Maybe if you'd bundle pubgrub as a compiled extension, you coukd get pretty close to uv's perf.