As a force of habit, before I put my device to sleep, I run a task manager to kill any extra tasks. Frozen Bubble can easily be killed without losing game progress(unlike the PC version). I think the market has a task manager you can download for your eDGe.

I build my white list in the task manager by running the task manager right after a fresh boot and white listing everything that's there. Then when I press the end all, it will terminate any new tasks since boot. It works really well in keeping my eDGe very responsive. I use this very same method on my Android phone to keep it running smoothly. Most task managers allow you to place a end all widget on your home screen, to make it easier to terminate them. I also set the task manager to terminate itself, so that it does not take valuable system resources or cause issues when suspending.