I have problems opening JSP and XHTML files. When choosing a JSP file from the "Open ressource" dialog, I have to wait more than a minute (far more than a minute!) until the file is finally shown in the editor. The Eclipse process is really busy during that period of time and the program does not respond.
If I remember correctly the problem occurred when upgrading Eclipse from 3.5.1 to 3.6 and remains ever since. I also upgraded to Eclipse 3.6.1 with no effect.
I tried out the latest Indio build yesterday and had no problems opening JSP files. Unfortunately Indigo is not stable enough to be used in production environment right now so upgrading is not an option at the moment.