Process is stalling

I’ve got a library of over 1000 images and a lot of different sizes for each one.

This plugin is stalling constantly.

Is there any way around this? I’ve been using the solution in Offset Rebuild Start Point Solution which is extremely helpful, but it’s still stalling after only processing as few as 2 or three images sometimes.

https://www.ads-software.com/plugins/ajax-thumbnail-rebuild/