Some applications cannot close itself. But if you are doing things like running Telnet, Verichat, etc, they have an exit option. There are often three default applications running: Messages, Home Screen, Browser. Those applications cannot be exited. But if you have more than three running at once, try to exit the other ones by hitting the Esc key or selecting an Exit option in the menu.
Now, memory can be used up by too many emails, or too much software. You can scroll back about 30 days of emails, and then select a date, then select "Delete Prior" to delete all old emails older than the date you've selected in the Messages list.
If you do not use BrickBreaker or Password Keeper or certain software, you can remove them from Options -> Applications ... That will free up a little bit more memory.
Finally, you can reboot your BlackBerry by hitting Alt+Cap+Delete, wait 5 seconds, then hit Alt+Cap+Delete again. (or you can remove and reinsert the battery). That clears up some memory.
Once this is done, hopefully your Calendar will speed up somewhat.
Also, try to obtain BlackBerryOS 4.0.0.185 ... It is slightly faster than 4.0.0.171 for things like these. If not, just be patient -- there are slight BlackBerryOS 4 speedups to improve things.
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