Why do pages load quickly on Safari on macOS, but not on Chrome?
There is no specific solution or answer for such a thing. First, Chrome is a memory hungry application. However, here are the basic reasons. For others, we have to know the details. 


Reason 1: Your Cache is Beyond Overworked
Reason 2: Chrome is Outdated
Reason 3: Flash is Always Enabled
Reason 4: Overzealous Plugins/Extensions


Clear the cache, revmoe extensions and disable flash if needed. 

But as I mentioned earlier, these are the primary workaround. Else, you can try to reinstall your Chrome.