Setting cache_device to cpu eliminates JPEG Artifacts in Flux (Even at High Thresholds) - add to readme (?)

[couleurs256]

cache_device="cpu" Eliminates JPEG Artifacts in Flux (Even at High Thresholds)

Problem:
With cache_device="cuda" and rel_l1_thresh > 0.4, Flux outputs show blocky JPEG-like artifacts since recent ComfyUI updates, color banding, and noisy fur/textures — especially on FP8 or quantized models.
Lowering rel_l1_thresh around 0.22 fixed the issue but removes any generation speed improvement.

Fix:
Switch TeaCache → cache_device="cpu" solved the problem after hours of headaches
→ 100% clean output, even at thresh=0.4+
→ Only ~10–15% speed loss vs full GPU caching
→ Works reliably after ComfyUI updates (v0.3.75+)

Before/After (same seed, Flux.1 Dev, 20 steps or more, thresh=0.40):
Before, with cache device set to cuda :
After, with cache device set to CPU :

Now it works flawlessly again. I'm new to github, but maybe this could be added to the main readme file and help troubleshoot issues. I spent hours finding this solution and wanted to share it.