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(Paid job) Help me fix WordPress problem.

On one of my servers I'm having an issue where I can't use various themes' import function for importing demo content. The themes that do give an error throws a 503.
I'm using a DirectAdmin + Cloud Linux and Imunify360 setup.
I'm willing to pay a few bucks to whoever can help me fix this. Just shoot me a PM and we'll take it from there.
DuelHost.dk : 20FOR30 YEARLY - LINK
Comments
I will help for free!
That error will likely mean your account is running out of memory or your CPU is being maxed out whilst importing, which explains the 503 error. If you're using CloudLinux, have you made sure your LVE limits are set higher than default?
I'm running it on a 32core/64thread Epyc cpu with 128GB memory. LVE values are set to: https://cln.sh/afsvD5
DuelHost.dk : 20FOR30 YEARLY - LINK
PHP is set with these options: https://paste.ubuntu.com/p/qfq5dhrhFw/
DuelHost.dk : 20FOR30 YEARLY - LINK
Have you tried to increase webserver + php timeouts ?
Its happening with only specific theme or with every theme ? Install astra theme and try to import demo content if its working then must be issue with that particular theme only.
EVERYTHING IS MUCH BETTER THAN IT WAS 1 YEAR AGO
It's happening with every theme. Otherwise everything works fine, but no theme can import demo content. I have tried with 5-6, including Avada which I know works as I can do it in a VM.
DuelHost.dk : 20FOR30 YEARLY - LINK
Every theme errors out after just a few seconds. Php max execution time is 3600 so that shouldn't be a problem.
DuelHost.dk : 20FOR30 YEARLY - LINK
Most likely this is RAM issue but have you also checked that you have appropriate permission to write in folder where it is importing?
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I tried disabling LVE for the user, no difference.
Sometimes it actually imports a few photos, so the directory is writeable.
DuelHost.dk : 20FOR30 YEARLY - LINK
A 503 error is 9/10 resource based so I'd be focusing on that, sounds like a very odd issue you have.
Hm, I fixed it. I Switched from lsphp to cloud linux php selector.
DuelHost.dk : 20FOR30 YEARLY - LINK