After updating to PHP 8.3, DB read/write got extremely slower

I think I did something wrong with configuration, but can’t figure out what it is and where to fix. Wonder if you guys have any suggestion.

I have updated my server’s PHP from 8.2.11 to 8.3.1 yesterday. Since then, I have following issues

• Redis Object Cache’s maximum cache % is 69.4% w/ 25MB
• After systemctl restarting Redis, PHP, and Nginx, initially it works as before, but after sometime, it becomes extremely slow

After updating PHP, I have not yet removed 8.2, so I tried to go back, which gives me no issue like above. Is there any potential configuration that I have to touch?