Hi Kurt...
Several of us have the issue with it just hanging and becoming unusable for about 5-10 seconds. It's absolutely horrible. I've noticed it's not a pattern though. Some days it'll only have a few times, while other days it happens several times an hour. It's VERY annoying and I'm totally considering either going back to ST6 or even gaim.
I posted a thread on the delay here:
http://www-10.lotus.com/ldd/stforum.nsf/DateAllThreadedweb/df16b62e8a4c8307852571f1004dcc37?OpenDocument