In my case I still have a problem with it but it isn't nearly
as bad as it was with CF MX7. I guess I really started noticing the
problem when I had a report open that had a few layers of embedded
subreports. My main report has about 6 different sub-sections and
each sub-section has a few subreports. It got to be such a problem
that I couldn't even work on the main report without it crashing as
soon as I tried to make any kind of change.
The way I "solved" the problem was to make dummy stubs of my
higher level sub-sections. So if I needed to make changes on the
main report, I would first change the name of the stubs to what the
sub-sections were called. That way the Report Builder doesn't have
to access all the sub-reports, it just grabs all the stubs, which
really made a difference in the crashes.
Other than that I just live with the crashing since Report
Builder only takes a couple seconds to load.