--xformers	Enable xformers for cross attention layers. Use xFormers library. Great improvement to memory consumption and speed.
--opt-sdp-attention	Enable scaled dot product cross-attention layer optimization; requires PyTorch 2. May results in faster speeds than using xFormers on some systems but requires more VRAM. (non-deterministic)
--opt-sdp-no-mem-attention	Enable scaled dot product cross-attention layer optimization without memory efficient attention, makes image generation deterministic; requires PyTorch 2. May results in faster speeds than using xFormers on some systems but requires more VRAM. (deterministic, slightly slower than --opt-sdp-attention and uses more VRAM)

--medvram	Enable Stable Diffusion model optimizations for sacrificing a some performance for low VRAM usage.
--medvram-sdxl?	enable --medvram optimization just for SDXL models
--lowvram?	Enable Stable Diffusion model optimizations for sacrificing a lot of speed for very low VRAM usage.

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