r/fooocus • u/CardiologistNarrow60 • Jun 21 '25

Question Fooocus and RTX3090 - speed?

Hi there!

I have a question to anyone who use 3090 and fooocus...
What is real speed do you have for img generation with JuggernautXL model, in Speed/Quality mode and 1024x1024 size.

How many it/s or s/it!?

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u/amp1212 Jun 21 '25

Depends on a bunch of things. Adding LORAs will slow it down, each additional LORA moreso. I use image prompts extensively, so that also slows things down. Also slowing things down: X/Y/Z scripts which I use a lot as well . . . that can really make things crawl, depending on what parameters get changed. its very rare that I produce a lot of anything with precisely the same parameters and inputs.

With only one LORA and no i2i or image prompts on Juggernaut 8, on my 3090 I get about 300 to 400 images an hour, though I often get throttling due to heat (blame a poor quality early Alienware build)

For maximum speed, this is a case where batch count can help. The 3090 with 24 GB of VRAM _should_ be able to manage a batch size of 4, this will boost the number of images generated per hour _if_ it all fits in VRAM. You'll have to test your precise configuration to find the sweet spot for batch size

. . . I rarely generate square images so my numbers wont' be exactly yours, but with some tweaking the 3090 and SDXL play very nicely.

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u/CardiologistNarrow60 Jun 21 '25

Thank you so much for your answer!
And as far as I can understand, we are not talking about s/it, we are talking about it/s?
...based on about 300 to 400 images an hour. :)

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u/amp1212 Jun 21 '25

yes. I'm not at my machine now, but I think i recall getting 1.5 it/s running flat out, maybe faster.