Hi there,
I have never had an issue with this until recently updating to the newest classic version. Since doing this, any time there is an update to a quest (like pick up an item etc) it causes the whole game to lag and a box to appear in the top left corner momentarily. It has almost made the game unplayable to the point of uninstalling this. I have tried doing a fresh install with no change. Is this a known problem? Is there any way to fix it?