Recently I noticed that when using docker executor even builds with circleci convenience images they aren’t stored on the host, but that’s not the main problem, as it gets downloaded instantly. But quite often the build is in spinning up environment stage, sometimes taking even more than 1 minute to spin up cimg/python convenience image. One extreme example here: download speed is 86mib/s, while extracting speed is only 959 kib/s, so the spinning up environment takes almost 3 minutes while the actual workflow is pretty simple:
https://app.circleci.com/pipelines/github/bitcartcc/bitcartcc-orb/40/workflows/5693f53e-d118-40b6-bff7-674cf4618534/jobs/104
Another example:
https://app.circleci.com/pipelines/github/bitcartcc/bitcartcc-orb/45/workflows/eacdc5bb-3e50-4296-b59d-2d80acaa3916/jobs/119
It actually happens like 1 in 2 builds, pretty often
I believe there is some issue with disk write times