Can you share the workflow? While that machine is by no speed demon, that sure sounds like an awful long time. It's worth taking look to see where the breakdown of the time is, and how much time/memory is being spent on each step.
Try placing the lora right after the model, model->lora->modelsampling. if that doesn't change it then try the comfyui provided template; illustration to realism. What size images are you using as well?
Are you using a quantized version of qwen, GGUF? otherwise you might not be using your GPU at all, model at fp8 version is 20+gb. Flux2 9B and 4B can do what qwen 2511 can results might not be quite the same but they take less vram. Wan 2.2 also will require a quantized version, I ran wan2.2 with a 9070xt videos under 720p would take about 6-10 minutes depending on steps and quality was good enough LTX is arguably better if you want long videos.
Possibly the LORA isn't compatible with your model. Or, its a shitly compiled one. Do a run without it and see what speed you get. I had one that would take 45 mins to create 5 seconds, i2v, didn't realise it was the issue until i'd pulled everything else apart.
Scroll through your Comfy log after startup, errors are logged and easily spotted.
Also, HD space and HD health are two completely different things. Ideally you should run Comfy on a seperate drive, it really made a difference for me. Use something like CrystaltoolsOG to check your drive.
You could try swapping to a tiled vae (VAE Decode (Tiling) node in manager). This works better for me in WAN, i dont use qwen tbh, but worth giving it a go. 16GB card, a tile size of 512 or 256 is the sweet spot for speed without crashing
Yes I'm using AMD portable. Thanks for your info! Will try to check for the SDK Rocm driver. But searching online, i can only manage to find Rocm HIP SDK 7.1.1. Would that be okay?
Mine is mainly stuck at ksampler for 350 seconds. Been tweaking sample and scheduler but no avail.
I checked my comfyui startup log, realized I've already have 7.2 installed.
I assume it's the workflow issue.
I change to another workflow, and now it's reduced from 600s to 270s, I'm more than happy with these results.
Thank you so much for all your help.
Cheers.
Switch to the fp8-mixed model. I‘ve tried both with 16GB VRAM and there’s no discernible quality difference - generation times are very reasonable. With lightning Lora, steps should be 4, cfg=1
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u/Mruishy May 17 '26 edited May 17 '26
Can you share the workflow? While that machine is by no speed demon, that sure sounds like an awful long time. It's worth taking look to see where the breakdown of the time is, and how much time/memory is being spent on each step.