Sloooooooooowwwww

Update: seems to be working better now with WP 3.5.1, and a new Apache instance from my host as my whole site was having slowness issues. I have successfully managed to import a dozen files at a time instead of just five. Still not ideal.

Yep I had the same issue. I made a small analysis of the problem in this post:

https://www.ads-software.com/support/topic/freezes-when-uploading-many-large-2mb-pictures

I really wish this developer would update this plugin or perhaps someone could take it over. Its really useful and such time saver with big batches! If it worked properly!