Pictures and videos can be set to the desired resolution. The higher resolution, the bigger the file and the slower it displays. With the low resolution of pictures and videos, the display would be notably faster. However, for those using large screens, the low resolution would be noticeable because displays on the big screen require high resolution for clearer viewing. However, if you think most of your users are using the ordinary computer – desktop or laptop or even tablets – then you can go for low resolution graphics to save on space and for quick access.
Today most are using high resolution computers and televisions and therefore using high resolution images and videos are very essentials to gain more views and traffic.