You can improve it by fixing whatever makes it run like hot garbage on Windows 10 on a current PC with modern specs. Premiere Pro runs fine.
We're a couple of iterations into Rush and playback still stutters and lags on Windows 10 with modern hardware. Premiere Pro runs fine. Sync on, sync off, doesn't matter ... use optimized clips checked, use optimized clips unchecked, doesn't matter. For a piece of software that is supposed to be used for quick editing, it is halting and infuriatingly frustrating. Don't know what the issue is, but it has been consistent since introduction. A few cuts into editing, and playback just completely stalls the system. Editing is effectively useless because playback will not keep up with the playhead.