much higher CPU usage after upgrading from php:8.3-v4-slim-apache to 8.4-v5-slim-apache

[jdmcalee]

I discovered that our app's CPU usage has a significant increase in CPU usage after switching to the 8.4-v5 image (see graph below). I noticed that the JIT ini defaults change resulted in JIT being enabled, so I explicitly disabled it during our image build. Unfortunately, that had no impact on CPU usage. We did not make any changes to our application when we changed to the new image. Any ideas what might be going on, or where else to look to figure this out?