YJIT makes the app slower on Digital Ocean App Platform / DOAP (the Heroku-like product, not Droplet VMs): the container runs in a sandbox (gVisor) where system calls are very expensive, and YJIT makes a lot of them while compiling.
Request latency over ~10 minutes in production:
| YJIT off | YJIT warm-up (first ~5 min) | YJIT after warm-up |
|---|