Answer: images do not use a compressed format like JPG, image resolution too high
Step-by-step explanation:
an image might take a lot of resources to load if it is high resolution, also if the image has a format that is uncompressed, it can take a lot of resources to process and use up a lot of bandwidth. I do not believe large font size should impact the performance. Also, image resolution being low only boosts the performance. Image dimensions being too large shouldnt do anything if the resolution is still low enough.