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I have recently upgraded my iPhone 3G to iOS4 and there is some noticeable performance issues will some of the basic tasks (text messaging, loading application, etc.)

I have restarted my iPhone and that only resolves the performance issues temporarily.

Is there any way to speed up my iPhone 3G with iOS4 installed?

Update

I have upgraded to iOS version 4.0.1 yesterday and a lot of the performance issues seem to be resolved. I still see some issues with trying to run apps while listening to music/podcasts.

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    I've been noticing the same thing on my 3G since upgrading to iOS4. Mail and Messages sometimes take quite a while to fully load. Jul 14, 2010 at 22:04

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According to this post on Gizmodo you can edit the preferences for the Spotlight search feature for a speed boost:

Go to Settings->General->Home->Search Results (Settings->General->Spotlight Search on later iOS levels), and shut off everything you don't need (I disabled Music, Podcasts, Video and Audiobooks; leaving Contacts, apps, Notes, Mail and Calendar checked). Made my phone a lot quicker, more like it was with v2 (I'm still running v3.1.2, jailbroken).

Before, there was a good 2-4 second lag when exiting or loading an app. Now it's back to it's old speediness

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    Thanks, that solved the issue. You should update the path to Settings->General->Home Button->Spotlight Search
    – Michael Kniskern
    Jul 29, 2010 at 19:51
  • Thanks very much Rich, huge improvement with this tip. Evernote in particular loads dramatically faster now. Jul 29, 2010 at 23:46
  • I did this a while back, and while I think it had some effect, the improvement was not huge. Even with version 4.1, which was supposed to fix this, at least my iPhone 3G is still way more sluggish in most things compared to pre-4.0 versions.
    – Jonik
    Sep 17, 2010 at 23:03
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Reset the phone to factory defaults and reconfigure it. It's a lot of work but the performance is almost as good as iPhone OS 3.1.

I've just tried this yesterday and I'm very happy with the results. If you use GMail and/or Exchange accounts (or others) to manage e-mails, contacts and calendars you'll only have to reconfigure your apps.

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    Can you comment how is the performance after several days and with all the apps again on board?
    – Eduardo Molteni
    Jul 29, 2010 at 14:53
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Apparently doing a hard reset a couple of times in a row can improve the performance:

Speed Up iPhone 3G + iOS4 with a Hard Reset?

(via Lifehacker)

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    The sounds more like a band-aid than a permanent fix. I will try it out and monitor my phone's performance over the next few days.
    – Michael Kniskern
    Jul 14, 2010 at 23:43
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    I still don't get why resetting twice it's better than one reset.
    – Eduardo Molteni
    Jul 21, 2010 at 20:36
  • @Eduardo agreed. Resetting more than once sounds like an urban myth. The article doesn't say why that would help. Sep 3, 2012 at 16:50
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I'm wondering if some of the apps are holding onto memory when you close them, at least the ones that are utilizing the new multi-tasking functionality, and slowing it down? Try removing all of those from the multi-task tray thingy and see if that helps.

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    Multitasking is not supported on the iPhone 3G. It is only supported on the 3GS and 4.
    – Michael Kniskern
    Jul 14, 2010 at 22:46
  • Does deleting them from the multi-task bar close the app? It seems that if I've been using the phone for a while since a reset, deleting an icon, slids another into view, it seems that there may be 15 or 16 programs running, is there a way to tell the phone, "I'm done with this app, don't put it in the background" without the delete step? Kinda like the difference between minimize and close on the desktop>?
    – BillN
    Jul 29, 2010 at 15:18
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If you jailbreak, you can disable some unnecessary launch daemons...not a trivial task though. An interesting read, if nothing else lol.

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