If you hover over an item on your character sheet while the Stat Summary feature is enabled, your game freezes for half a second. Disabling the Stat Summary feature fixes this problem.

Could you share your locale, race, talents, and gear? There are a lot of variables that could affect this and it's definitely not a universal problem.

Here's a quick video. All addons except RatingBuster were disabled. Locale is English.

I've pushed some performance changes in 1.5.6. Here are some examples of the reductions in CPU time I'm seeing. The -25% is likely just variance in testing, but BuildGemmedTooltip, GetStatMod, and RemoveEnchant are the functions I specifically targeted for improvement.

Have you had any improvement with version 1.5.6 or later?

Also, I couldn't help but notice that your Strength is converting to AP at 1:2 even though you are talented into Endless Winter. Which makes me wonder; did you by chance install RatingBuster from CurseForge? If so, that is not the version of the addon that this repo is for.