About python reading image url time-consuming problem

Image 1: Image size: 8333*6250 occupied memory size 13.6MB

Image 2: Image size 1220*730 takes up memory size 344kb

1.

image = io.imread(ImgUrl)

Image 1 Time-consuming: 6.694000244140625s

Image 2 Time-consuming: 0.13499975204467773s

2. 

response = requests.get(ImgUrl)
image = Image.open(BytesIO(response.content))

Image 1: Time-consuming: 5.842999696731567s

Image 2 Time-consuming: 0.1510000228881836s