So here is a comparison of the master denoiser and new E-Cycles denoiser:
The noisy image at 36spp (is the same in both master and E-Cycles):
The master denoiser (21sec render time):
and denoised with E-Cycles (21sec render time using current builds, 10sec render time using the improved processing time):
Most of the render time is preprocessing and postprocessing in all cases. The actual path tracing is done in 3sec.
Edit: By the way, it’s the blend file from evermotion as is, with only the spp at 36 and the compositor denoising. So it’s setup in some seconds.