Omnisphere within Logic is very sluggish…. and it drags down the entire Logic UI while the plugin’s interface is open. The standalone Omnisphere app is still fast.
Previously, in Mojave, Omni was fast within Logic too.
I don’t know what the change was, but I’ve seen YouTube videos of Omnisphere + Logic running just fine on an M1 Mac, so it’s not necessarily Big Sur that’s the problem.
I’m using a 2018 6-core Mac Mini with eGPU. No change with/without eGPU.
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