With help of LCM LoRA and Kohya Deep Shrink, now you can generate 2048*2048 image from noise with no issue in just 6 steps
WARNING: directly 2048*2048 generation is VRAM hungry, tune it down if you have limited resources
Other useful CustomNodes using:
https://github.com/Derfuu/Derfuu_ComfyUI_ModdedNodes/ for convenient input nodes
https://github.com/WASasquatch/was-node-suite-comfyui/ for loading model with name and advance image save
https://github.com/marhensa/sdxl-recommended-res-calc/ for SDXL optimal size calculation
https://github.com/twri/sdxl_prompt_styler/ for SDXL styling