I'm sorry I've had a lot going on. I have a v3 in the works, and I'm getting rid of the old Thickbox and replacing it with a better jQuery alternative, that's also fit for responsive sites.
In the new version I believe I've drastically decreased the load on servers, espeically since I've taken the AJAX calls from 3 to 1. Less overhead that way.
The new code has literally been written from scratch, and I've scrapped everything from the existing plugin, hence the V3. Not to mention a more simple and less confusing options panel that now includes the WP Visual Editor instead of those plain old text boxes. I still got some kinks to work out between clients but expect by the end of the month, if not the beginning of the next.