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If you find mod_fcgid: can’t apply process slot for /var/www/cgi-bin/cgi_wrapper/cgi_wrapper in error log and your plesk server is lagging with high cpu and memory usage.

This can happen because of many reason and the main one is your Apache web server is not properly optimized. In that case you can order our optimization service

SERVER OPTIMIZATION

We will optimize your server for best performance

The other reason is your code is not compact-able with the current PHP version.

I guess your php version should be PHP 5.4 or above.

You can get it fixed by downgrading your PHP version from php 5.4 to 5.3

Run below command to downgrade php version

yum downgrade $(rpm -qa –queryformat=”%{name} \n” |grep ^php)

If you are facing any issue downgrading follow our detailed step  here  Plesk Downgrade from php 5.4 to 5.3