Unfortunately I have massive FPS drops with the latest version (1.7.3). (From normal ~90+fps to 20-15fps) Unfortunately no Lua errors. On version 1.7.2 everything is as usual.

And yes I have many many addons installed and when I am back home tomorrow I will try to switch everything off and then on again one by one ;)

I had the same issue and I confirm that "Better Wardrobe and Transmog" was the cause. Solved by disabling this one.

Should be fixed in the 1.7.4 release