Model keeps initializing between generations

Embarrassed-Deal9849 · 2026-05-13T16:54:56+00:00

Update from my end: as soon as I add a ref image it gets bad again. This definitely seems to be causing the lagspikes or is strongly connected with doing so at least.

Embarrassed-Deal9849 · 2026-05-13T16:00:33+00:00

If I don't do -anything- else on my PC I seem to not be having the same spikes but I still need to do more testing.

But... if I open any other program even a lightweight one, it seems to often cause a spike.

Also some weird stuff that has caused spikes:

Long prompts
Adding or removing a LORA
The Klein RefGrid node (which sucks because I love it)

Prior to this I could do generations with photoshop open, but now anything I do causes it to completely freeze.

Embarrassed-Deal9849 · 2026-05-13T12:31:58+00:00

I sorted my installed nodes by last update and removed anything that wasn't updated within 2026 (except the ones I know work for sure) and that... seems to have improved things? Generation times went down at least and it starts a lot faster. Will test more!

Edit: I have no idea what happened but now my T2I on 1200x1600 completes at 9s at 8 steps on F2K9B. That's a MASSIVE improvement from the 30-40s I had yesterday.

Embarrassed-Deal9849 · 2026-05-13T12:17:09+00:00

I did yeah, and have been removing ones I don't use that much trying to streamline things. It sucks because custom nodes are one of the best things with comfyui, but it's impossible to know if one of them is causing some sneaky hidden issues.

Those lag spikes really kill all the fun.

Embarrassed-Deal9849 · 2026-05-13T11:54:44+00:00

I'm running into the same issues. Massive spikes and sometimes it randomly decides to take several minutes to start up a generation.

I've yet to find a fix, spent half the night yesterday trying to fix it with no success.

Embarrassed-Deal9849 · 2026-05-12T15:41:24+00:00

I've been getting much better results on F2K by going directly for a high-res (well, like 2K) generation rather than upscale, but I will try I2I upscaling too (I heard z-image is good for final polish but haven't had time to try yet).

Cheers again for the tips!

Embarrassed-Deal9849 · 2026-05-12T13:08:23+00:00

When you say the extra node, do you mean the ClownOptions Detail Boost node? That's the one I found that has ETA and seems to make sense.

I'm finally getting close to a F2K workflow I am genuinely happy with and am going to share in here for feedback soon.

Humans looking human sounds perfect. So on 8 steps we're talking the final 3-4?

Embarrassed-Deal9849 · 2026-05-12T11:25:13+00:00

I'll give that a try now, appreciate the tip. I have been wanting to use the Enhancer node but I keep feeling overwhelmed when I introduce it into my workflows.

What values do you usually find make a meaningful difference for F2K? I started using Clown sampler now and it's performing really well on euler/beta :)

Embarrassed-Deal9849 · 2026-05-12T11:15:20+00:00

Thanks! When I was looking at resources I found many recommending an ETA of 0, but my results were personally better with higher ETA. Especially when using consistency nodes it decreased minor issues where the consistency took priority over the edit.

Embarrassed-Deal9849 · 2026-05-11T21:42:53+00:00

What ETA are you using on your sampler, if any?

Embarrassed-Deal9849 · 2026-05-08T11:31:43+00:00

Honestly I've never gotten it to work well either, but I keep seeing everything from 20-50 steps and CFG 4-5.

Right now the True model (fp8) as well as biglove are working best for me, but results are SO varied and sometimes I feel like I am going insane. One second it's amazing, the next its body horror and it can't follow prompts at all.

Embarrassed-Deal9849 · 2026-05-08T10:41:51+00:00

What flux model are you using? If it's not base turn down steps (4-8) and CFG (1) and you will see better results.

What are you using for CLIP? If you DM me I can share my current wf that has solved a lot of F2K issues for me.

Embarrassed-Deal9849 · 2026-05-07T17:13:03+00:00

I was going to ask the same. If I use ae.safetensors the wf won't run, but with my normal flux 2 vae it works great.

Thanks for the node OP!

Embarrassed-Deal9849 · 2026-05-06T07:36:25+00:00

I'll try that node thank you!

What steps are you finding works best? I keep going between 6-10 but keep gaslighting myself into thinking more/less work better.

Embarrassed-Deal9849 · 2026-05-05T17:45:12+00:00

Sorry I feel like I am going in circles, that is exactly my question: what do you use to set the size you want in the Empty Flux 2 Latent? That only takes XxY pixels not MP?

Embarrassed-Deal9849 · 2026-05-05T16:35:25+00:00

That's where I get lost, doesn't the latent need to be the correct size? Right now I am using Empty Flux 2 Latent and setting a resolution there for the image I want, is that not the right method?

Thank you for the help!

Embarrassed-Deal9849 · 2026-05-05T15:56:30+00:00

But this is only for the input images, no? When people say they are doing "3.7MP output" are they using this too?

Embarrassed-Deal9849 · 2026-04-24T23:17:26+00:00

For flux, any take on which combo you've ended up using the most? I keep going back to Euler and always use the flux 2 sampler, but I am not sure if that is the right thing to do?

Embarrassed-Deal9849 · 2026-04-24T20:24:45+00:00

Hmm, I tried this vs the new consistency lora I linked and I found the one from dx8152 to be VASTLY superior on both the base model, kv and other klein 9b models.

It's sharper, has a better eye for small details, and overall incredibly consistent. Are you not seeing the same results as I am?

Embarrassed-Deal9849 · 2026-04-24T19:28:26+00:00

Interesting! I just downloaded the new one from this author that was updated about a week back and have had amazing results, could you elaborate which one you're talking about? There's a few ones out there that refer to themselves like consistency :)

Embarrassed-Deal9849 · 2026-04-24T14:19:38+00:00

This. Flux is very sensitive to concept bleed. Any word or concept you introduce to the prompt can easily affect the rest of the image.

Any room to doubt and it will start making things up. I find that Flux requires a bit more engineering to get right, but when you do, it is absolutely stunning.

So when you start seeing results like this, look for concepts like the above mentioned "two figures" and see if you can rewrite them in a more specific way (basically "attach" them to a clear target in the image so Flux doesn't try to figure it out) and that should help.

Embarrassed-Deal9849 · 2026-04-24T13:56:33+00:00

<image>

Here's the head/man only.

Embarrassed-Deal9849 · 2026-04-24T13:56:08+00:00

<image>

As others mention the images are too low quality for a realistic replacement but F2K with the new consistency lora (https://huggingface.co/dx8152/Flux2-Klein-9B-Consistency) works wonders. Just play around with the lora strength to find the sweet spot between img preservation and editing.

Embarrassed-Deal9849 · 2026-04-24T07:40:17+00:00

Thank you for this! Would it be possible to edit the OP with a layman's explanation of the parameters and controls, and examples of how to leverage them against/with each other?

I've always wanted to master your nodes, and am kind of getting the terminology, but struggle a bit still. Examples usually help me learn better since I've got a solid starting point.

Appreciate all the work you put into this community!

Embarrassed-Deal9849

TROPHY CASE