[dhd415]

I don't know why the release was so late, but I'd speculate that it took a while to find enough compelling reasons to go from 32 to 64 bits on Windows. Having run Waterfox, the third-party 64-bit build for Windows, for some time along with the 64-bit version of IE, I haven't seen any real difference in performance relative to the 32-bit versions of those browsers.

[bryanlarsen]

Websites like https://clara.io and https://www.onshape.com/ really appreciate having a 64 bit browser. Loading a large model on a 32-bit browser often results in random crashes.

[CamperBob2]

The performance difference is substantial. Seems to be mostly due to memory usage patterns. With more than a few tabs open, the 32-bit version pauses annoyingly every few seconds. The 64-bit build does a lot better.