This is why I am on Mint. Turn off CPU vsync, turn on full-frame composition (which uses the vsync on the graphics card), and bam! silky smooth 60fps, with quick responses and no lag. I haven't tested it, but I imagine this new "fast" version of gnome will still feel slower and choppier than cinnamon when vsync is handled on the gpu. (I just wish it was the default setting.)
That and I'm not a fan of the side bar in Ubuntu. Most people agree, Mint's desktop UI and UX is just more pleasant.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/1175
Kind of hard to get excited about perf improvements when relatively basic functionality manages to be broken for at least 7+ months and counting.