Issue Any idea what that might be?

[hopeyeu]

Plesk panel too slow

I'm still using Plesk 17.5.
The panel of my Plesk is very slow and I do not know why. I saw it here and load average seems normal. It is around 2.90 and I have 10vCores and 4GB of RAM. So it seems everything is ok.

Any idea what that might be?

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[Monty]

Check the output of "top" to see what's going on on your VM:
* Do you have a high CPU load? If yes, which processes are causing it?
* Do you have a high percentage of wait state?
See this for more information: Understanding Linux CPU stats

Further reading:
Isolating Linux High System Load – tummy.com, ltd.
Troubleshooting high load average on Linux
Understanding Linux CPU Load - when should you be worried?
Understanding the Load Average on Linux and Other Unix-like Systems

Also, please be aware that "more vCPUs" does not necessarily give you "more speed" on VMs:
Maximizing VMware Performance and CPU Utilization
Maximizing vCPU Performance: More Isn’t Always Better | Expedient - Expedient

And of course also check your storage subsystem, maybe you have an issue with your storage system. Keyword: High I/O wait numbers in "top" or "vmstat" output.