ed. But if the sigmas array always stays on the CPU, the CPU and GPU sync doesn’t occur and you don’t get any latency. In general, any CPU and GPU communication sync should be none or be kept to a bare minimum because it can impact inference latency.  Combine the attention block’s projection matrices The UNet and VAE in SDXL use Transformer-like blocks which consists of attention blocks and feed-forward blocks. In an attention block, the input 