I am on 8.5 - but honestly can’t remember if it was an issue back in the 8.04 days. Big difference too in this equation are the latest v4 RME drivers (currently @ 4.06) that most certainly will have a bit of an effect on things.
Personally tho - I am starting to doubt Wavelabs stability overall as it seems to be the only pro level app out there that consistently won’t play nice with standard vendor plugins (Piles of threads on that topic in here) and this ongoing saga with RME.
Almost seems like WL has it’s own “non standard” methods to talk to industry standard plugins and drivers- which in turn fail when you really need it to work.
With something like Studio One over here - I honestly have never actually seen a glitch, slowdown, hesitation or anything else using the same plugins and audio interface that is available to WL.
So whatever Presonus is doing in their app - maybe they can share some of that magic with PG and get WL back to stable.