Cutting it into tiles and creating a custom Google Maps view of it would have been nice. It looks[1] reasonably simple to do, and means your users don't need to try and render a 15kpixel wide image. Even with 4G (ok, that's not all that much these days, but I still consider it reasonable) of RAM, it took down my browser.
RAM usage jumped about 280MB when viewing the full size image. No problems with my system choking with 4GB RAM and plenty of programs open (2.5GB used). (Tested in Firefox and Opera, Win7x64.)
[1] https://webtide.wordpress.com/2007/09/13/adding-google-maps-...