Comment by brian.ireilly: I'm also experiencing slowness on Mac OS X Leopard (10.5.8). I'm still on Safari 4.0.3 because of the problems I'd heard that people were having with 4.0.4, however I see the same slowness in Firefox 3.5.5. Where I really notice it is with a GWT-RPC loop that I have. Basically, I'm fetching a batch of results using GWT-RPC and adding them to the view in a loop until there are no more results. It's really fast when compiled and deployed and was slower but tolerable in hosted mode in 1.7. 2.0's development mode, however, is noticeably slower than 1.7's hosted mode. I wonder if it's something to do with serialization of data back to the client or if it's overhead with GWT-RPC calls or server round trips in general.
For more information: http://code.google.com/p/google-web-toolkit/wiki/UsingOOPHM -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
