Hi,
Android virtual devices are inherently slow, we always advise to use real Android devices for most of the development process. That said, there are a few ways to speed up virtual devices.
Try using Intel HAXM, we have a tutorial on how to set it up. Also the newer Android platform AVDs are slower, i.e. versions 1.x and 2.x are faster than 3.x or 4.x.
As for the trial expiry, you can email our sales team to ask for a trial extension code if you need more time to evaluate VisualGDB.