This was a hard nut!
We got this error with a LiteSpeed server running a WordPress site.
Trying to upload an image resulted in the error “wordpress image upload error: Post-processing of the image failed likely because the server is busy.”
Adding the following to the site’s “.htaccess” resolved it –
<IfModule LiteSpeed> SetEnv MAGICK_THREAD_LIMIT 1 </IfModule>
* This is effective for LiteSpeed servers only
Tags: litespeed, Wordpress
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