Recently, my BlackBerry has been being real slow.
Opening an application (even when it's running) like Messages or Media takes around a second. It's not too bad but...
When I am opening, sending, or exiting a text message it takes 2-4 seconds. Which seems like forever.
I have a 2GB microSD card inside so I would expect it to be a bit quicker but it's not.
I would suggest checking out the memory guide in the How To section.
It really helps. I would also suggest to you getting rid of some of the apps that you don't use. Thatll do it.
Posted from my CrackBerry at wapforums.crackberry.com
Make sure that when you are exiting out of apps that you properly close them via the menu button then select close........additionally if you partake in 3rd party apps/widgets - some of those that "run in the background" are also memory stranglers.........