In the earlier post I reported that NetBeans 6RC1 had serious performance problems. After installing the latest ATI graphics driver and disabling XGL, NetBeans' performance was enhanced to levels seen in the past with older releases and is now quite acceptable. My only comment (and concern) is how XGL could have had such an adverse impact on NetBeans' performance.
Again, as I mentioned in the earlier post, Eclipse 18.104.22.168 did not have this performance problem. I hope it isn't due to the fact that NetBeans depends on JFC while Eclipse uses its own widget toolkit, SWT. I did run some of the simpler JFC examples from the JDK (SwingSet2 and Java2D) and found no performance issues running them. I wonder what special features NetBeans is now using from Java that might cause this?