Dude i have like 400 addons.
400 add-ons?!
The datablock limit is 4050 according to how I dont get a too much datablocks message.
Hes probably using slow Internet Explorer,if thats it I cant help you,I use google chrome.
Just delete all your add-ons in the add-on folder or. Just reinstall the game. I don't see why you needed help on this, Such an easy fix.