image in website

Site has nothing to do with images. We use images to influence users and if your images are looking good there is no need to worry

i have many image in my website i dont want my site comes up hardly 

in load page faster widtg and hiegh of image is important or size of image?

Ultimately the size of the image in KBs determines. Also I would avoid slicing images as it will increase load on server as browser will make multiple calls for getting one image