High CPU usage

Just after a bit of advice really.
I have a VPS with two xenforo forums hosted.
At present one has 9 members and 118 guests online, the other has 4 members and 15 guests. Both sites are running slow to load and the CPU is showing as being between 74% and 100% used.
This is my CPU on the VPS:
CPU Model : AMD EPYC 7282 16-Core Processor
Max Frequency : 2800 MHz
Cache Size : 512 KB
Core Count : 6

I contacted the host and they said 'we checked that...

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