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Every time you generate mipmaps, or change or add anything in a region, you will get stalling, if the ajoining regions aren't restitched.

Quite often I do work on several regions at a time, but don't do the stitching until all the work is done.

What I do is open the region with the main start positions, and stitch all the regions from there, then save the region.

This method saves a lot of time, and has always worked for me.

Note; Whatever you do, don't use the "batch generate mipmips". You won't like the results.