Originally Posted by lightspark
It's a legit issue which was addressed in oUF 9.0.
It's caused by bugs in Blizz API, but they highlighted shortcomings of our own event system. So it's a blessing in disguise 
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I suppose i should update then

(though current UI has been done during BfA from scratch). I didn't experience huge fps drops but maybe they system is overkill for WoW so i didn't notice.