Here is what my host support says is the issue:
In the .htaccess it has.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
-f = file
-d = directory
The -f is the problem. It means it's processing the rules for every "file", meaning every thumbnail, etc. If it was just directories it would not be so bad, but with your traffic amount this rule is sending thousands of calls to the CPU per second.
So, question is. Is there a solution for this?
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