My site is just a Gatsby blog with … 4 MDX articles. It builds in 1min on my computer with fresh gatsby caches.
Without netlify build plugins, it builds in 5 minutes (which is already significantly slower than my own computer, but it has to yarn install + restore cache + other steps… still a lot slower).
With netlify build plugins, it times out. I clearly don’t think this is a problem on my side. As the logs show, on the deployment you linked, the “saving pip dependencies” step takes like 10 minutes, before the 15min timeout is reached.
At you can see in this screenshot, my site build command, and the postbuild plugin has already run 10 minutes before the timeout is reached.
This is clearly not a problem on my side.
My site did build in the regular 5 minutes in the deployment you linked.
cf the gatsby build log: 12:23:11 PM: info Done building in 287.455754854 sec
You can see that from 12:23 to 12:31, the site is stuck during 8 minutes at the “started saving pip cache” step. This IS the cause of the build timeout, my site is not the cause.