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That’s very odd. I would have expected a significant speed up to be honest because RSpec allocates a lot of objects, especially when used with factorybot.

Can you instrument each test with timing information? It would be interesting to see if all tests are slower on average or if there’s a few specific ones that are *much* slower.

Garbage collection time is exploding ! YJIT in test is disabled. Enabling it makes it even worst. We don't have any particular settings for the GC in our app