Is there a standard file size recommendation to optimize web images?

Question

I remember, during college (2008), my web design professor made a point to keep all images' file size **at/below 40K** (didn't matter what the dimensions). I have made an effort to do so ever since, especially with mobile optimization being so important. But now, with broadband and LTE/4G speed internet, larger data plans... and I being out of college for a while... are there any file size (not dimensions) standards out there? Side note: My project is dealing with product photography. I'm looking at Amazon.com as a benchmark and note that their product images are under 40K (usually) with a zoom image under 100K (usually).

Answer 1

It really depends on the image size, but you want to try to keep most images file sizes under 1Mb for speed purposes, because large images will slow down a website and this wouldn't be good on mobile.