I experience the same slowness here on my Macbook Pro 2019 and Macbook Air 2015, both running Mac OS 10.14.6.
Scrolling is really slow, and also in FX Chains- view the square following the active fx chain (when hovering with mouse) is really slow. Almost seems like running out of memory/CPU power, when this should not be the case.
This doesn’t happen all the time, but really often and when emote starts being slow it doesn’t recover on its own.
I also get some audio dropouts if using emote on MBP while running ableton. Perhaps some memory leak in emote program code?