But I wasn't thinking diffusion. Models are big and slow. GANs still reign in terms of speed and model sizes. I mean the StyleGAN-T model is 75M params (lightweight) or 1bn (full) (with 123M for text). That paper notes that the 56 images they use in the Fig 2 takes 6 seconds on a 3090 at 512 resolution. I have a 3080Ti and I can tell you that's about how long it takes for me to generate a batch size of 4 with an optimized TensorRT model. That's a big difference, especially considering those are done with interpolations. I mean the GAN vs Diffusion debate is often a little silly as realistically it is more a matter of application. I'll take diffusion in my photoshop but I'll take StyleGAN for my real time video upscaling.
But yes, I do understand how fast the field is moving. You can check my comment history to verify if register isn't sufficient indication.
(Note the links to various SD compilers).
But the whole field is moving so fast that people aren't even adopting the compilers and optimized implementations at large.