comfyui-launch-flags

# ComfyUI launch/performance flags ## Overview ComfyUI's runtime behavior is controlled by CLI flags passed to `main.py` (e.g. `python main.py --reserve-vram 2 --use-sage-attention`). The three that matter most for making a graph *run* — rather than OOM or crawl — are the **VRAM strategy**, the **attention backend**, and the **cache mode**. This skill is the decision matrix for choosing them. > ⚠️ **Verification note (June 2026).** Every flag below was checked against > upstream [`comfy/cli_args.py`](https://github.com/comfyanonymous/ComfyUI/blob/master/comfy/cli_args.py). > ComfyUI adds/renames flags often — when in doubt run `python main.py --help` > in the target install and prefer that over this list. One common non-upstream > flag: **`--enable-triton-backend` is a SwarmUI backend flag, NOT a ComfyUI > `main.py` flag** — don't pass it to ComfyUI directly. > ℹ️ **How to apply today.** The MCP's `start_comfyui` currently *replays the > exact argv of the previous run* — it does not compose fresh flags. So set > these when you launch ComfyUI yourself (the `python main.py …` line, a > `run.bat`/shell alias, or the SwarmUI backend args box), then `start_comfyui` > will preserve them on restart. (Injecting flags through the tool is a tracked > follow-up.) --- ## Decide first: which flag do you need? ``` Symptom ▶ Flag(s) to try ───────────────────────────────────────────────────────────────────────────── CUDA out of memory, long...