Are you using the latest version of WinUAE? If so you should just be able to go to the "Quick Start" section and choose which Amiga you want to emulate. A500 for example and the settings are pretty much setup to emulate at it's normal speed (though I think it defaults to 512k chip ram so for some games you may want to bump that to 1meg)
What games are you playing? You should definitly be able to Emulate at "normal" speed though. It's great if you want to run a super Amiga with OS3.9 and 32bit Workbench though at blazing speeds as well. Best of both worlds.
