Sprint HTC Hero : RAM/ROM Usage For Certain Programs

After pretty much a day of doing nothing on the phone except a few texts (GPS and WIFI were on all day), I got home and started playing with the phone. It got SOOOOOOOOOO slow (and I'm not nitpicking, I'm talking WinMo-hang-slowness....believe me, I understand a little bit of lag, but this was insane!) so I checked the Applications and Manage Applications. Now I know everyone's first answer is "get a task manager, etc" but I am not going to give into that, because I believe it'll cause more problems, or at least potential for more problems, by adding more variables to the equation if something goes wrong. I was looking at some of the applications that seem to be using quite a bit of RAM/ROM and had a question for the community:

The biggest 3 applications were:

Mail - 34.80 MB (34.25 MB Data + 556 KB Cache) and using 6.78 MB Ram
Contacts Storage - 4.09 MB total (all data) and 11.56 MB RAM
com.android.providers.calendar - 2.78 MB total (all data) and 11.02 RAM

What does everyone else's look like? I know I'm not going to be touching the Contacts Storage or com.android.providers.calendar stuff, but what happens if I clear my data and cache in mail? I have it hooked to an Exchange Server at work. What exactly gets cleared, and will that help with any of my lag? Do these numbers look pretty representative of everyone else's?