What is pagefile and how does it relate to ComfyUI?

Pagefile is Windows’ backup memory—when your RAM fills up, the OS spills overflow onto your disk (usually an SSD). Disk is roughly 100x slower than RAM, so when pagefile kicks in, everything slows to a crawl. ComfyUI workflows are notorious memory hogs: loading a large diffusion model (SDXL, Flux) can eat 12-24GB, and the denoising process adds another 8-16GB depending on resolution and batch size. If your system has 16GB RAM and you try to run a 24GB workflow, Windows will page out to disk, turning a 30-second generation into a 10-minute slog. Solutions: use quantized models that fit in your actual RAM (GGUF, NF4), increase pagefile size as a band-aid, or upgrade RAM. The pagefile isn’t the problem—it’s a safety net. The problem is trying to run workflows that exceed your physical memory.