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Spriting is actually harmful for performance except in specific HTTP-1 scenarios.

Doesn't McMaster Carr still use sprites? Is that like the one optimization they managed to get wrong?

Looks like it, but isn't this site famous for being a "classic" storefront?

Some CMSs would auto-generate sprites. If you are showing most of them, it's still a positive, I'd assume. And, if it ain't broke, don't fix it.