Okay to Leave Activated?

I would recommend you deactivate any plugin you don’t need and I would be disingenuous not to include P3 in that group.

I’ve done my best to make sure P3 is optimized and won’t slow down your site, so you shouldn’t feel any trepidation leaving it active if you’d like to read the documentation, run the occasional scan, or review your past scans.

But, if you don’t need it, deactivate it. You probably won’t notice your site loading any faster, but it may shave off some memory usage in php.