Well, there are various ways to cut down render times at the cost of realism. Here are some ideas:
- Use a denoiser (I would suggest the Intel AI denoiser as it's fast and provides good quality)
Performance tab:
- Lower Max Sample Intensity from the default 20 to 10-5, but probably not lower
- Lower Max Ray Depth from the default 25 to about 10, but probably not lower
System tab:
- You can enable highlight clamping (set it higher than 0, probably around 1-2) but keep in mind that this will destroy the high dynamic range in your frames in case you are planning to save into a 32-bit format and do some post adjustments.
Camera tab:
- Enable sharpening+blurring - this will slightly blur the noise and make the frames a bit more "photo-like"
If there are no moving objects or lights, only the camera, I would use the UHD Cache and calculate it only once, then reuse for all frames - see:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000515648