Web app performance in iOS 4 has been disappointing. It’s been speculated that Apple has been intentionally handicapping web app performance in iOS 4. When websites are launched from the iPhone’s homescreen, loading times become much longer than when a site is opened straight from the Mobile Safari app.

In iOS 5, it’s been discovered that fullscreen web apps from the homescreen can access the Nitro Javascript engine that sped up Mobile Safari in iOS 4.3. These “dynamic-codesigning” privileges allow for a much faster web app experience in iOS 5.

For some reason, web apps launched from a homescreen shortcut in iOS 4.3 fail to use the Nitro engine that is available when regularly browsing in Mobile Safari. This means that visiting websites through shortcuts can result in much longer load times than the traditional method in Safari itself.

CNET discovered that this bug has been fixed in iOS 5 Beta 1, and that Nitro JavaScript engine access is now disclosed to the Web.app feature. We showed you a roundabout way to speed up web apps in iOS 4, but it looks as though that method will be unnecessary when iOS 5 drops this Fall.

Although unconfirmed, it was speculated that Apple was hindering web app performance (prior to iOS 5) in an attempt to handicap apps that didn’t come from the App Store. If that’s the case, it looks like Apple got the message and fixed the problem in iOS 5.

If you’re got the iOS 5 beta, have you noticed a performance improvement in web apps launched from the homescreen?


  • Cameron

    It’s so typical of Americans only putting America on a logo i.e. Safari

    • Masters

      Not true, Canada’s there too! I say that in the most condescending way possible without using the words boohoo.

      • Cameron


    • Chschuldiner

      Umadbro? Not our fault we rock.

      • Boogie Pop

        He’s just a hater

      • Cameron Carlyon

        Umm shut up? You don’t rock…

  • James Wolfe

    There’s just not enough room on the icon to include all the Euro-weenie cheese eating surrender monkey nations. Those are on the back side. 😉

    • Cameron

      Fuck You. Maybe that’s how you Americans see us be we are the best citys in the world.

    • James Wolfe

      OK sorry I know the US sucks! Don’t beat me up!

    • iCameron

      And if we are “Surrender monkey nations” then why did the US only join the war at the end? Get your facts right! Americans…

  • Monkey

    Blah no flash. Am returning my ipad2 since there is no jb for it. Don’t wanna pay $700 for a device that can only be used for browsing Internet

  • BloodRain

    @Monkey what would the jb do besides tweaks? it dosnt turn into a car ya know, and it does alot more then browsing the web,have you hear of this app called “appstore”? “itunes” thems is nifty lil apps,i mean yeah they go online,but i dare you to look at the app..impressive huh? and all that stuff u dont need a JB for

    i use the holy jeebus out of my ipad 1 & 2

    remote desktop,mirroring my desktop,media player through airplay,AVPLAYER to watch all my movies with no converts..

    all of this and then some with aboslutly no jailbreak…wow.

    i think the only thing i dont use is safari (up until ios5 that is)

    just some tips enjoy

  • Levi

    HTML5 support with rate of 31 fps. When google chrome has 32fps

  • Levi

    Im sorry I left out that before safari on iPhone and iPod touch only had 3fps now it will have

  • Levi


  • Rob

    “James Wolfe says: June 18, 2011 at 3:18 pm
    There’s just not enough room on the icon to include all the Euro-weenie cheese eating surrender monkey nations. Those are on the back side.”

    Dude – you gotta come clean the coffee off my monitor that I just spit out! That was one of the funniest things I have read in a long time! Well said sir 🙂

    • Cameron Carlyon

      Was not funny, it was racist! Screw You!