I have been in contact with the author of AGI-64. He said to let him know of anyone else who is interested in helping out with the tedious task of play testing AGI-64. I have already started some testing with SQ1, so far only as far as the escape pod landing on Kerona. Keep in mind that this is the C64, so it struggles a bit to keep up with the animation requirements of AGI at times, so I think the slowness of the animation is a known and currently expected feature. You don't need a real C64 to test on. The VICE emulator is sufficient and the process of loading and running a game is very easy, and quick, assuming you have a pre-built .crt file, which the author would be able to provide you with.
Send me a PM if you want me to send you his direct contact details.