When I was using version 2.1, I was very happy that the rendering time was fast and the previous speed issues had been fixed. However, version 4.1 seems to have changed the rendering and now takes 5-7 hours to render 4 minutes of music that would have taken maybe 15-20 minutes on the previous version on the exact same settings.
I don't really have time for that if that's how rendering will be from now on. Unfortunately, I'm also not able to use version 2.1 anymore because the trial period expired on it. Here's the last video I made with version 2.1: https://www.youtube.com/watch?v=43ZX_x7hILA - It's a good testament of version 2.1's fast rendering because that song came out just five hours before my video was out. In fact, I'd say that version 2.1's rendering only took about half the time that my editing software took to render the final product, which is impressive.