As said in the other topic, if you uncheck “Sax & Brass” both SL10 Fast mode and SL11 Fast perform equally fast. Checking Sax & Brass requires an additional AI model which slows things down.
Regarding unmixing options, nothing is removed in SL11 from SL10, so if another workflow or module works better for you, it’s still available in SL11, no need to use SL10 