Even in an operating system that supports 32bit binaries, there shouldn't be any runtime overhead if you stick to 64bit apps only, except maybe a few megabytes

Even in an operating system that supports 32bit binaries, there shouldn't be any runtime overhead if you stick to 64bit apps only, except maybe a few megabytes of wasted disk space. (which could even have been made into an on-demand component install, if that's too much to spare) For those of us with legacy 32bit apps and games, having them run ("slower" is in the eye of the beholder, as they perform as well as they always have) is better than not running at all. When I run a legacy 32bit app, it's not like I'm bothered by the fact that it also loads a bunch of 32bit OS libraries. It's not like I feel like my value for money for owning the machine is restored if clicking the .app icon just shows a "Not supported" dialog box.