Hi, today the Blender Foundation published the next step for Cycles, work name Cycles-X with a new architecture, kicks tile rendering and better performance.
Test builds of Blender 3.0.0 cycles-x branch are: https://builder.blender.org/download/branches/
Technical presentation docs of CyclesX: https://docs.google.com/presentation/d/13Zo2gafKyIFEyZCBucEfFHrrrwz9RBQoIImC6nBCgEE/edit#slide=id.p
My first test render are very fast but view port render does not work at all on Linux and some files are not rendering at all.
I am testing on Windows now.
It is all experimental and new but may be a nice week end fun to test.