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This decodes the image with the VAE in tiles which should be faster and
use less vram.

It's in the _for_testing section so I might change/remove it or even
add the functionality to the regular VAEDecode node depending on how
well it performs which means don't depend too much on it.

On the KSamplers denoise of 1.0 is the same as txt2img but there was a
small difference on UniPC.

It can be used to apply multiple control nets at the same time.

The extra step doesn't actually call the unet so it doesn't belong in
the progress bar.

Use: --normalvram to disable it.

Try to keep batch sizes more consistent which seems to improve things on
AMD GPUs.