C;\ is being used when comfyui is running, then liberated when comfyui is shut down.
Your question
My device went as low as:
When running a workflow related to pulid: https://github.com/cubiq/PuLID_ComfyUI/issues/93
As you can see in that issue I was trying different configurations of models versions trying to make it work (still don't know which config works)
When I closed comfyui, it went back to:
How can I tell ComfyUI to not use memory from C:?
BTW, the running comfyui I was using was located in another disk than C. Also my cache base path for huggingFace stuff is outside C normally. So I don't know..
The rapid decrease in C: drive capacity while ComfyUI is running is typically due to insufficient RAM, causing swap to occur. Please check this.
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