At the beginning of this week I updated to 2020.09, and since then Friendica has run very slowly. When I reboot the VPS, it runs very fast for a short while, and then gets bogged down again. I use Plesk to monitor the VPS, which is only running Friendica, and almost the entire 4 GiB of memory is constantly in use. I can also see that the "Apache & PFP-FPM" memory usage is at 792 MiB, which I believe is high.

However, I cannot figure out why this is occurring and see no apparent errors in the logs. But also because I have had no errors in the 6 months I've been running Friendica, I don't know exactly what is "normal." Any assistance troubleshooting this would be greatly appreciated.