Bug? Beta 3 #4 slows to a crawl

In rapid debug, changes on the screen which appear instantaneously in legacy debug take 8 seconds per change in "rapid" debug. There is a lot of code behind each change and I don't know where it is bogging down. No errors in the Logs tab.

While single-stepping through the code, if I press F9 to step over a sub, it may take several seconds, but if I press F8 to single-step through the sub (a short, simple sub), it goes as fast as I can press F8.

Rapid debugger is slower. In some cases it is too slow. It is not a bug. It is a limitation.

Its performance will be improved in future versions.