Heyo. I see no issues at ~1.1Ghz, in normal version of blender, so the cause must be more specific than just armature being present. Does it happen to any armature to you, or only certain files?
First, can you look if there’s anything in system console (Window > Toggle System Console).
Then, try changing UV update from ‘always’ to ‘manual’ in the addon panel, and see if anything changes.
