Hi, thank you, do not hesitate to rate the app and to speak about it to your friends :)
Could it be something like what I implement on v9.4.0 in video recording settings screen (see QQGO menu). I implemented FOV/cropping video guide to allow people to see exactly what is really captured on 16:9 format for example. You should try that. And yep it increase the performances, but just a little.
Come back to me with your tests ;-)