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I wonder why it took so much longer on OS X than Linux?

• evmar 12y ago
  (I worked on Linux Chrome back in the era when this change was made.) 64-bit was important on Linux because the system libraries that Chrome uses were increasingly unavailable in 32-bit versions on 64-bit systems. On other platforms, while there are advantages to 64-bit binaries, those advantages haven't outweighed the other useful things you could be spending engineering time on.