Oh gee, I do not know what has changed, how or why, but when I box x5 1 window has only 3 fps and is unplayable.
I thought maybe somehow profile has screwed up, so re-ran the wizard and re-did it, and same result.

I even tried disabling all mods including jamba/isboxer, everything... and it still has 3 fps, seems to be just 1 specific window and I can not work out why, this is happening now from nowhere, or better yet how to fix it to be normal again.

All windows are on Good, thats never been an issue before, only until 2 days ago or so. :/