I bought a laptop camera module and attached to a USB cable and it pegged my raspberry CPU at 90% and soon I started receiving temperature warnings through that

I bought a laptop camera module and attached to a USB cable and it pegged my raspberry CPU at 90% and soon I started receiving temperature warnings through that thermometer icon on the screen. I wonder why webcams don't directly use the onboard graphic card. Even the cheap webcams all suffer from the very same problem. The reason I bought laptop card, I thought it would be higher quality and lower price and would be good for monitoring my 3d prints. I've no found any Raspberry Pi camera with autofocus with IR filter intact ( I need it for full light use and better colours during day time)