AGK benefits from putting a lot of work that any app needs to do inside the engine, and everything inside the engine is coded using the native languages of the platform, which means it runs at native speeds for the most part. The T1 BASIC language converts down to byte code that has been designed for speed, not beauty, so although the byte code structures are larger than they could be, they also run very fast indeed using every crafty trick in the book. T2 C++ of course compiles down to native code anyway, so those apps will be marginally faster. We've seen lots of games in the short time AppGameKit has been available, and performance is certainly not an issue as far as we know. Even the browser platform which is still under development is running at many thousands of FPS, which is nice
I drink tea, and in my spare time I write software.