# Edit this File and Variances of it for serveral Render-Presets and save it under: ......\3.0\scripts\presets\cycles\sampling\YourFilename.py

import bpy
context = bpy.context.scene

# Output Properties ==> Very High Speedimpact
context.render.resolution_percentage = 75

# Sampling ==> Highest Speedimpact              
context.cycles.preview_samples = 16
context.cycles.use_preview_denoising = True
context.cycles.preview_denoiser = "OPENIMAGEDENOISE"
context.cycles.preview_denoising_start_sample = 16
context.cycles.use_preview_denoising_prefilter = False

context.cycles.samples = 48                     
context.cycles.use_denoising = True
context.cycles.denoiser = "OPENIMAGEDENOISE"
context.cycles.time_limit = 0
bpy.context.view_layer.cycles.use_denoising_prefilter = False

# Adaptive ==> High Speedimpact
context.cycles.use_adaptive_sampling = True
context.cycles.adaptive_threshold = 0.05        # 0.25/0.1/0.05/0.01/0.005/0.001 
context.cycles.adaptive_min_samples = 6         # Value: Samples divided by 4 is good to go (divided by 8 for higher Samples)


# Light Paths ==> Very low Speedimpact          # Normally use Defaults 12/4/4/8/12 => Double or triple for Glass/Caustics
context.cycles.max_bounces = 12
context.cycles.diffuse_bounces = 4
context.cycles.glossy_bounces = 4
context.cycles.transmission_bounces = 12
context.cycles.volume_bounces = 0
context.cycles.transparent_max_bounces = 8

# Caustics
context.cycles.caustics_reflective = True
context.cycles.caustics_refractive = True

# Fast GIA => Medium to High Speedimpact!
context.cycles.use_fast_gi = True
context.cycles.ao_bounces = 0
context.cycles.ao_bounces_render = 3

# Performance
context.render.use_persistent_data = True