ComfyUI crashing with OSError/WinError 1455 (“The paging file is too small”) is one of the most common Windows stability killers—especially when loading heavy models like FLUX (FP16) or running WAN 2.2 video workflows.
This article explains (in plain language) why it happens and walks you through the safest, repeatable way to fix it by tuning Windows Virtual Memory (page file). It also covers the hidden “gotcha” that makes many fixes fail: low free space on the system drive, which prevents Windows from actually creating/expanding the page file.
Inside the guide:
• The real cause of Error 1455 (RAM/virtual memory pressure, not “random ComfyUI bugs”)
• A practical checklist for disk space and Windows settings
• A model memory table (SD 1.5 / SDXL / FLUX / WAN 2.2) to estimate what your system needs
• Clear warnings about the exact steps people miss (so the change actually applies)
• Optional cloud GPU workaround if you want to stop fighting local memory limits
Read it here: