If you have the latest version, go into [workspace]/prefs/boot.txt, set cppia.enabled=true, and test on the "Cppia" export rather than Windows. It's still experimental, and you may need to run Stencyl as admin the first time (still trying to figure this one out). It should be a little bit quicker than a fresh compile, and then any subsequent builds should be pretty fast. (For example, a game that took 34 minutes to compile fresh now compiles in 2 minutes every time.)