I would like to know if this is allowed. Because I used the VBA 1.8 beta and the fps were too bad tbh. And also I asked this because I don´t want to waste my time on speedrunning a banned emulator ^^.

TASVideos recommends BizHawk for runs. I have used BizHawk with the mGBA core for my runs on the Category Extensions. A quick Google search shows that one as the most accurate.

In the end, it is up to Ethan to decide. Unfortunately emulator runs are currently not regulated at all in the GTA community.

Thanks I might give a try to your recommendation. ^^.