5 Ways to Speed Up your iPhone 3G on iOS 4

by Jeffry on July 25, 2010

Is your iPhone 3G running slow and become unresponsive on iOS 4? If you have installed iOS 4 on your iPhone 3G then you could be hit by epileptic seizure and if not, then make sure that you don’t update your iPhone 3G to iOS 4! iOS 4 is darn slow on iPhone 3Gs and many people are reporting that iPhone 3Gs are almost unusable. If you have inadvertently installed iOS 4 on your iDevice then you may follow following ways to speed up your iPhone 3G.


How to speed up your iPhone 3G running iOS4

Hard Reset your iPhone 3G

Hard reset will clear all RAM buffers, caches, etc from your iPhone 3G memory. Perform the Hard Reset twice to get the desired effect. In order to Hard Reset your iPhone 3G follow simple steps listed below:

  1. Press-hold the Home button (big circle below the screen) and the Sleep/Wake button (on top of the iPhone) simultaneously for 5 to 10 seconds.
  2. Continue holding both buttons (Ignore the “Slide to power off”) until the iPhone shuts off and begins to restart.
  3. You may let go when you see the silver Apple logo.You have completed a hard reset successfully.

Disable the backgrounds

It might be possible that while jailbreaking iPhone 3G on iOS 4 using redsn0w you have enabled backgrounds to give the icons a nice shadow effect. But the shadow processing consumes large amount of memory on your iPhone 3G making it sluggish in performance. You can disable the backgrounds by editing a file. Just follow the instructions below:

1) SSH in as root and install ericas utilities
2) Navigate to /System/Library/CoreServices/SpringBoard.app
3) Convert the plist we need from binary to xml so you can edit it in a text editor:
plutil -convert xml1 N82AP.plist
4) Edit N82AP.plist file, and change this line:
5) Save the file, respring (maybe reboot).

to this:
6) Navigate to settings, general, spotlight and uncheck everything except apps and contacts.

Restore the iPhone to Factory Settings

You can try restoring the iPhone 3G to factory settings but make sure you choose to set it up as a new phone rather than restoring your backups. Most of the users have reported that the method indeed speeds up your iPhone on iOS4, but you may end up loosing your data not synced with iTunes. In order to get your iPhone 3G to work smoothly again you need to sacrifice something.

Turn off Spotlight Search and Multitasking 

Turning off spotlight search reduces the overall workload of the system. Just navigate to Settings -> General -> Home Button -> Spotlight Search, turn search indexing off for as many items as possible. Follow the instructions posted here to disable multitasking on iPhone 3G.

Downgrade your iOS 4 to 3.1.3

Finally, if none of the method is working for you then you may follow our guide posted here in order to downgrade iOS 4.0 back to iOS 3.1.3.

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  • thatmffm

    Here’s how to get iOS4 running properly on a 3G. This post really only concerns seasoned iPhone jailbreakers who are having issues with their 4.1 upgrade… if that isn’t you, you probably just want to skip this blurb…
    This is apparently a pretty widespread problem, and I seem to have found the fix… I’ll warn you now, it’s fairly labor intensive, and it requires a pretty good grasp of the inner workings of your root folder, or just plenty of free time to google the steps you need to take. I’m not going to break down HOW to do it, just WHAT you need to do.
    I’m running iOS 4.1 on my Iphone 3G- it was running slow when I first upgraded, and I had an issue with the proximity sensor not recognizing when the phone was away from my ear during a call- basically, the screen would go black when I was on a call, and not light back up when I took the phone away from my face- which meant I couldn’t hang up on anyone, and I’m ALL ABOUT hanging up on people, so I had to correct this IMMEDIATELY.
    I heard rumors that the proximity sensor issue & speed issue could be resolved by a factory restore AS A NEW PHONE, but I didn’t want to lose all my contacts & what-have-you-
    Here’s how I got everything running smoothly…
    I backed up my contacts, calendars, safari bookmarks, & KEYCHAINS (remember that for later) manually via SSH (i use Fugu), cooked my own custom jailbreak firmware with PWNAGETOOL, restored as a new phone with my cooked OS, and the phone seemed to be running faster than it EVER did running 3.1.3. (Battery life also improved). Then I SSH’d into the phone to put back all the files I saved earlier.
    I’ll spare you the details, but suffice it to say, everything worked fine, until I restored my KEYCHAINS files, at which point the proximity sensor issue started up again.
    I was forced to factory restore AGAIN, with my same cooked firmware… this time I replaced only my Contacts, Calendars, & Bookmarks, but NOT MY KEYCHAINS.
    I just re-entered that info manually, which was a pain, but it somehow did the trick, as I am now running a fully functional jailbroken version of iOS4 on an iPhone 3G with NO ISSUES WHATSOEVER regarding speed, battery life, or proximity sensor issues.
    AT&T’s service still sucks though. =)

  • Jji454

    Bob, you’re kinda well…a douche.

  • Bob

    Running iOS 4 on a 3G is retarded to start with! Apple didn't intend iOS 4 to run on a 3G or they would have released it that way. Kinda like running Windows 7 on a Packard Bell 486. I got news for ya, rebooting the phone aint gonna help. Idiots..

    • Jji454

      Bob, you're kinda well…a douche.

  • http://twitter.com/garok89 Ross McAusland

    ….or install android on your jailbroken device….that should fix it….

  • http://twitter.com/kelvin8048 kelvin lee

    I notice faster speed and longer battery life after I installed iOS 4 in my 3Gs. This article is a bit surprising.

    • Nabeelbokhari

      iphone 3g has 411 mhz processor and 128 Mb so its a problem to 3g but after 2 to 3 years same problem will be with yours worry not

  • Oberoi_boyz

    my iphone doesent have service so it is used as ipod touch what people should do is end thier contract and spend about 10 bucks on a good calling app, and just use that

  • That Guy Over There

    Speaking as someone who hasn't had an epileptic seizure, but who does have a slower phone after the OS upgrade, I can honestly say that this article is no bloody help whatsoever.

    • Jeffry

      did you tried all of the methods?

      • Nickman55

        What methods?
        Hard Reset/Restore/Disable Spotlight – Yes, tthese are actual temporary solutions.

        Disable Backgrounds and Multitasking – Since you shouldn't have these to begin with, disabling them is not a fix for people who haven't jailbroken their phones

        Downgrade to 3.1.3 – How does this speed up iOS 4.0?

        Out of all the “methods” here, only half of them are actually useful.

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