I checked subtitles - still massive stuttering every 40-50 seconds, which is completely gone after disabling subs.
I still see tearing with the skin buttons (title, tags, genre, etc...), not graphics or pictures. That happens not all the time but sometimes when you scroll left or right and the buttons become "active" and resize. But that's no problem for me.
You have to use the advancedsettings.xml algorithmdirtyregions workaround. Do you know what this is? If not I'll give more instructions.
I am extremely sensitive to stuttering and this has fixed it for me.
This is an old issue which has never been solved and probably never will be.