Very slow during post save

After installed sg-cachepress save a post requires less or more 10 seconds.

If i flush all the caches (into the cpanel) save a post requires less or more 4/5 seconds, but after a while (maybe because the cache growing fast), save a post requires less or more 10 seconds.

Without sg-cachepress save a post requires less or more 2/3 seconds

Investigating into the code, the problem seem fsockopen on line https://plugins.trac.www.ads-software.com/browser/sg-cachepress/trunk/class-sg-cachepress-supercacher.php#L116.

fsockopen is a blocking request and need to wait for the server response.

A better approach is to open a persistent socket using pfsockopen. This will re-use earlier socket connections made by the PHP process, which doesn’t require a TCP handshake each time.