Blender is free software that everybody can use, Usually, I use Blender just for Lighting and Rendering
1. Install ACES
To use ACES colorspace is quite easy go to this ACES Github link and download it as an archive. Once it's complete, extract the latest version and replace it inside "C:\Program Files\Blender Foundation\Blender 3.5\3.5\datafiles\colormanagement"
2. Cycles Faster Volume Rendering v Blender Octane
This is quite a funny experience, I didn't really know if cycles could render faster than Octane. I had compared both render engines and decided to switch back to cycles. To make it faster play around with cycles.volume_max_steps. Decrease it to 128, and you will see a performance increase. For the volume step render rate, it may increase the render time but not too much.
For Octane I had enough with it. too many crashes. And the scene transfer is too slow. I don't think it's good for rendering heavy scenes. The only thing I like it's very easy to get a cinematic look