The Ability to see Media Clips names on the timeline (i have to open the project in premiere??)
Vastly improved speed when it comes to zooming and moving the timeline, i would suggest that creating thumbnails and scanning the media files that make up the timeline is a background task, and the priority is the ability to play the clip the cursor is placed on.

A note!
It seems that the Microsoft Defender service is having a large impact on the performance of Rush. Especially with many files, whitelisting the Rush process and folders with content improved the performance by a large margin.