These are some techniques you probably don’t know to make Blender’s cycles lighting fast. These tips are applicable for Blender versions 2.8, 2.81, 2.82, 2.83 and later
These include enabling multiple importance sampling, simplify the scene and reducing AO bounces, reducing bounces, using adaptive noise sampling, changing tile size, AI denoiser, and using Neat Video inside of After Effects.
Source: https://www.blendernation.com/2020/07/14/speed-up-cycles-blender-2-8/
