
With the updated version, Facebook's engineers have dumped the HTML5-based app and rebuilt it using Objective-C programming to make it perform more like a native iOS app.
From All Things D:
“People have different expectations when it comes to using Facebook for iOS,” Mick Johnson, Facebook iOS mobile product manager, told me in an interview this morning. “They expect a level of performance and speed that just wasn’t there.”Facebook for iPhone is available free via the App Store. [Direct Link]
Johnson says that the largest pain points — scrolling through the feed, photos and loading the app — will all be much faster, by a factor of three. Also, Facebook mobile developers working on the three separate iOS apps — Facebook, Camera and Messenger — all all now sharing a code base with each other, so Messenger and Camera are actually running inside of the proper Facebook app, bringing many of those features to Facebook for iOS. (As a bonus, a shared code base means faster development cycles, so we’ll probably see improvements sooner.)
Say Goodbye to HTML5 on Facebook's iPhone App

With the updated version, Facebook's engineers have dumped the HTML5-based app and rebuilt it using Objective-C programming to make it perform more like a native iOS app.
From All Things D:
“People have different expectations when it comes to using Facebook for iOS,” Mick Johnson, Facebook iOS mobile product manager, told me in an interview this morning. “They expect a level of performance and speed that just wasn’t there.”Facebook for iPhone is available free via the App Store. [Direct Link]
Johnson says that the largest pain points — scrolling through the feed, photos and loading the app — will all be much faster, by a factor of three. Also, Facebook mobile developers working on the three separate iOS apps — Facebook, Camera and Messenger — all all now sharing a code base with each other, so Messenger and Camera are actually running inside of the proper Facebook app, bringing many of those features to Facebook for iOS. (As a bonus, a shared code base means faster development cycles, so we’ll probably see improvements sooner.)