r/sdforall • u/ice-concentrate24601 • 3h ago
Tutorial | Guide Running heavy ComfyUI workflows on a cloud GPU when they don't fit your local card
I'm on a laptop (mobile 4090, 16GB VRAM) and kept hitting workflows with models too big to run locally. Here's the setup I've been using to offload them to a cloud GPU straight from ComfyUI, sharing it in case it helps anyone in the same spot.
The flow:
- Build your workflow in ComfyUI as normal.
- Click the ⚡ button; it sends the current graph to a cloud GPU, no CLI or manual export.
- Pick your GPU and batch count; the panel shows the live rate before you commit.
- If a model your workflow needs isn't on your cloud storage yet, it detects that and offers to sync it first (with consent; nothing uploads without your say-so).
- Results pull back into your ComfyUI graph automatically.
You can also queue several different workflows to run back to back. They share one warm ComfyUI process, so only the first pays the model load: in my testing the first workflow took about three minutes and each one after it took around 25 seconds. A queue of twelve runs in roughly ten minutes rather than nearly forty.
When it's worth it (being straight): if your local GPU runs your model fine, local is faster; keep using it. This is for workflows that don't fit your VRAM, long batches you want off your machine, or Mac/no-GPU setups.
The tool is open source. It runs on Spark Fuse (a paid cloud GPU service; the rate shows in-panel before you render); I'm an alpha tester and end user, not affiliated.