Hi Jerry, I just tested again. On my computer there IS a considerable speed up in 2.1. In 2.0.6 I do the two finger scroll and then wait and wait. In 2.1 the scroll is quite fluent. Not as fast as, for example, MS Word, but acceptable.
But then, it could be a different problem. In my case it was not only the scroll that got slower. Everything in LyX was slow, for example insert math. That seems to have been solved with 2.1.
