[BlackDynamite]

How many entries do you have in your calendar?

Delete the old ones that have passed and only leave the future ones. That will speed it up.

Mobile Shell has some kind of issue where if you have too many entries in your calendar it will slow it down. Combine that with Windows Mobile having an issue where calendar entries never get deleted, and it becomes an even bigger issue.

You probably have stuff in the calendar from years ago that you didn't even know was there- it just keeps getting backed up and restored.

Use something like MyPhone and you can archive the old stuff. That way you can keep it in case you ever need it for some reason, but it's not bogging down the phone. Mobile Shell will get a whole lot faster (no lag at all), and the phone itself will get faster overall.

I would definitely suggest you get a decent ROM too. The Sprint Stock ROM sucks. I am using indagroove's titanium. No sense having Manilla take up resources if you are just going to use Mobile Shell anyway. His ROM is rock solid, and way fast- perfect for Mobile Shell.