CYCLES - Noise issues with high emitters (or high number of emitters) - Lighting and Rendering - Blender Artists Community
Reduce Cycles Noise with Light Portals - YouTube
3D Rendering: Breaking Down 3D Noise
Render Smarter in Blender, with Adaptive Samples | Blender Render Farm | Blendergrid
Reducing Noise — Blender Manual
Too much noise with volumetric lighting with a slow computer? Try and render out in a higher resolution with lower samples, and then scale it down afterwords! : r/blender
How to DENOISE Your Images in Blender 2.80 - Beginner Tutorial - YouTube
Render Smarter in Blender, with Adaptive Samples | Blender Render Farm | Blendergrid