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Video generation (LTX2.3) became unusable/mega-slow after days of use #15005

Description

@CherrySkyArt

Custom Node Testing

Expected Behavior

Very first run on same workflow, prompt, ect should have consistent run time..

Actual Behavior

Hello,

This one is a weird mysterious one, and I have no exceptions but I'm making this issue to put in your radar, maybe lots of people having same issue.

Problem

  • Video generation became progressively slower day by day. I would restart comfyUI, then run my workflow, and notice it getting worse day by day.

  • I had the exact same set up, using same workflow, no knew nodes ect, simply generating videos for days. I was using basic LTX2.3 I2V workflow, and the video generation was progressively getting slower per day. It was like if I was maxed on RAM but I wasnt.

  • I would restart my computer, I could generate 1 or 2 vids, then infinity sluggishness

  • Eventually (few days) I would restart computer but couldnt even gen 1 vid, just doing 1 step on low resolution would take 20 minutes per step (i should generate a 10s vid in 10 minutes or less).

  • I did not have 100s of apps and 100s of tabs open, my RAM would peak at ~90% during video generation

I reinstalled today and it works again (shrug).

Version

  • ComfyUI Version sorta v0.26.0 (I git pulled at hash 04879a8, which is few days before v0.26.0
  • nvidia 5080 (16 VRAM)
  • 64 GB system RAM
  • startup script: .\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --disable-api-nodes --disable-auto-launch --disable-dynamic-vram --preview-method taesd --use-sage-attention --front-end-version Comfy-Org/ComfyUI_frontend@1.39.19
  • generating a 1024x1024 vid, 241 frames, (low res at 512x512)

Steps to Reproduce

???

Debug Logs

It is a silent error (the worst kind). Hangs at 0/8 steps. 20 minutes later I'll see 1/8

Other

No response

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