I'm having the same problem, seems it started in September. At some sims and parts of those sims I totally freeze at others it is fine. The second life viewer handles this a lot better over the firestorm viewer. When I checked with Visualroute connecting to those sims/servers seem to have a high delay responding, from 40 ms to Amsterdam to above 200 ms and more connecting to the US. There seem to be something wrong and how could this be solved?