Hello! Speak of the devil, we're currently working on some optimizations right now alongside the new features mentioned in our latest devlog (eye gaze direction, etc)! Based on our crude calculation with the current development build, it will bring up to 25% faster rendering time. Hopefully we'll be able to roll this out in the next stable update which also includes the free version, and then you can evaluate it yourself whether it is better or not (hopefully it *is* better).
Thank you for your feedback!