yeah I get loads of these errors constantly
its a bug that has been round for years that the dev team say to ignore
but it is hard to ignore the constant emails and notifications that pop up
and also the memory leak my server seems to have that I can’t put a finger on what it is… other than the fact that there is a bug in this plugin that hasn’t been fixed.
Thanks for you info. Also does this plugin uses high CPU/RAM on server? Just asking, because my server administrator is constantly notifying me of high CPU use!
use the P3 profiler: https://wordpress.org/plugins/p3-profiler/
This can help you detect the biggest plugins.. though this mainly works on page load times.
W3 should be reducing server load but there is every chance that improper set up or the bugs could be causing the high CPU usage.
If the scripts are not running correctly or closing off it could loop round a large number of times eating up RAM + CPU
Recently I have been having to restart my VPS every 2 days and I am starting to think it is W3’s fault.
The only thing you can do is Disable plugins one by one and check your CPU usage.
Another plugin that I’ve seen recommended for general housekeeping:
WP Otimize: http://wordpress.org/extend/plugins/wp-optimize/
I haven’t tried that one yet though – but I think I will 🙂
