更好的性能是什么?有几张图片可以根据空间大小调整，还是只有一张?

I have a webpage in which i use a picture as a background on several sections. It's a big one (around 1200x1200). But, every place where i put it have several size, for example, the footer has a size around 1000x1000, one section in the middle of the webpage has a dimension of 200x300 and the header around 1100x1100.I have a webpage in which i use a picture as a