A few months ago, I authored this post on troubleshooting long load times. There is now an even easier way to figure out which tables are slow loaders. As of version 7.12, this information is available in the Help menu — Support Diagnostics and Logging. Go to the Diagnostic Information tab and scroll down to the Application Information section. The load time information will be at the bottom of that section. It will tell you how long each table is taking to load.