turbo runs slowly with pnpm

[bitttttten]

Summary

We are moving from npm (node 20.12.2 and npm 10.5.0) to pnpm (9.15.4) and are seeing some of our scripts go from max 10s to up to 2 minutes.

. postinstall:  Tasks:    7 successful, 7 total
. postinstall: Cached:    0 cached, 7 total
. postinstall:   Time:    1m22.379s 
. postinstall: Done

with npm:

 Tasks:    7 successful, 7 total
Cached:    0 cached, 7 total
  Time:    7.862s 

Our postinstall script is just running pnpm run codegen, which is "codegen": "turbo run codegen",. If we run turbo run codegen then our codegen script still takes around ~1m30s. So we don't think this has anything to do with pnpm itself. Even after removing .turbo and installing a different turbo version (2.4.0) we still see this slow script.

How best can we debug this? Happy to provide more info if necessary.

Additional information

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Example

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