Generic ItemInstance pool getting very large

What could this mean?

http://dl3.joxi.net/drive/0001/3366/101670/160125/50b6e5b2b5.png
[DOUBLEPOST=1453747311][/DOUBLEPOST]because of this strong lag on the servers.

 

got the same error on my server whi is laggy sometimes. looking deep in all the warnings now to find solution.