Google Meet handles backgrounds a little differently from Zoom and Teams, but the constraints are the same shape: the image is rendered into a 16:9 frame and it needs to be light enough to load quickly every time you join. A heavy background slows the join; an over-compressed one shows artifacts right around your shoulders, where Meet's segmentation has to separate you from the scene. The middle ground is a correctly sized image at a moderate quality. Resize to 1080p, compress gently, and check the result. Skwish does this in the browser with a live size readout so you can find the smallest file that still looks smooth, and batch the whole set of backgrounds you want to rotate through. Nothing is uploaded anywhere, which is a nice property for a photo of your actual room.