Thank you so much for the feedback. I will work on it, especially the performance issues. You can track the progress: https://github.com/xcv58/Tab-Manager-v2/issues/2603

And please feel free to follow up in the GitHub issue.

PS: could you please try the v2.0.2?

The video has a demo 1,000+ tabs with smooth scrolling on chrome: https://youtu.be/ipQkN2dvDUY
And I manually checked on Firefox with 500+ tabs and the performance is really well.