Iphone 3G slow after update to IOS4

i had slowdown issues with my unbroken 3g
a bloke from apple rang me this morning yes sunday after i had emailed my local apple retail store
he said i should upgrade to 4.0.1 from a freshly restored phone and see what happens
i did this at 2pm today and up till now is spot on and i have used all of my apps all 67 of them and tried to cause a crash and have not encountered 1 single problem (safari has 8 windows open stop watch running and the timer counting down)
so put the phone back to its original condition and try it its worked for me
i think this might remain a problem for jbroken phones

Remember when installing any update to read what ti does 4.0.1 only corrects how the signal is displayed.the reason is so big as every update isn't a patch but a whole new operating system/firmware so always about the same size.if your phone is ok with 4.0 great if not 4.0.1 will not improve performance.
I gave up & Installed 3.1.3 back on.do a search for how.it's not too hard to to but read the Instructions carefully & when I did it it wiped everything so was like a brand new phone (had to add numbers & everything) I synched then with outlook &got em back from that & the apps back from iTunes along with my music (minus saves etc)
it was worth it if your unhappy.
don't rely on apple.I've yet to even have a response from them in the 15 months I've been a apple customer.
I won't be updating any firmware again....I'll stick with 3.1.3 & won't buy anoth apple product.
There overpriced & not supported. People can't afford £400 - £800 a year for a new phone.

theLarch wrote:
Drivel or not, I've done several of the things recommended on here (hold both buttons until it shuts off, restart, repeat; backup and restore; cleaned out caches, cookies, IM convos; freed up ram... etc.) and every time things get better for a short while, then everything slows down again.

For comparison's sake, my wife has a 3gs which is running the same iOS4 update. Her iPhone is speedy and responsive and I haven't had to do a thing to it.

16Gb 3g

This does sound as if the root cause is the limited amount of RAM (128 MB) in the 3G, as has been suggested elsewhere on this thread. After a forced-reboot, the 3G starts up with some (small) amount of free space, but as you use it, the RAM gets filled up with caches, tables, etc, and gets fragmented as well. I've been checking my RAM usage (using AppBox Pro) - right after a forced-reboot, RAM usage is around 82%. After a day or two, it's crept up to 95% or more.

You might want to obtain a memory monitoring app (there are several available), install it on both your and your wife's phones, and see if you can correlate the flaky behavior on your 3G with exhaustion of free RAM. I suspect you'll consistently see a lot more free RAM on the 3GS.

Hi,

For those collecting info about iOS 4.0.1 update... For me, iOS 4.0.0 was another catastrophic case of sluggishness with a phone sometimes barely usable.
Since iOS 4.0.1, it has amazingly improved the performance to a similar level as before with OS3! So in my case, I'm totally satisfied and it's a real release.

Now, it seems many are not so lucky, and some even declare there couldn't be any improvement since Apple mentioned only a new way of measuring the phone signal and modified bars for this update... Well, even though I appreciate their effort in finding out the truth, I must disagree for two reasons:
1. it's extremely obvious that for me the phone went from sluggish to a normal speed again (I tried it with many features for several days — and there's no decrease (yet?) in performance since then).
2. OK, Apple has not mentioned this problem as solved in this update... In my opinion, it is quite clear that they don't like to acknowledge or recognize that mistake they made, so no wonder if they hurried to solve it via updates without talking about it. What I think is that these updates also contain unofficial (hidden) features like these.
I'm really sorry about those who don't see any improvement, but for the other desperate cases, this update (or maybe another future one) might work... Don't forget that most of satisfied people don't report in such forums and that statistically it might be a lot more on the positive side.

Good luck! 😉

Had the same problem, fixed it like this.

1. Turn off push
2. Close down Safari after using it (have to do it manually btw)
3. Disabled spotlight
4. Disabled Multi Media Messaging.

This guy has the steps -

http://www.andrewstechnology.co.uk/reference/tips/38-iphone-3g-lag-fix.html

The old 3G probably just can't hack OS4 and lags and crashes if you try to use it however having done the above mine works without lag and doesn't get hot which it was doing.

I updated to iOS 4 on my 3G right away and then to 4.0.1. I did notice a considerable slowdown almost right away, but after going through several threads here I ran across the mention of folders being the culprit. Of course, one of the first things I did when I upgraded was put most of my apps in folders to organize things. I've since un-done that (i.e. removed all of my apps from folders) and the speed is back up to what I had with iPhone OS 3.x if not slightly better. The biggest features I was looking forward to were multiple Exchange accounts and the unified inbox, so I'm pretty happy over all.

Try taking your apps out of folders, then re-boot the phone (hold home button and power for 10+ seconds until you see the Apple logo) to delete and recreate the caches. It worked for me.

_Shorty-CM wrote:
Since it seems to sometimes take a day for the symptoms to arise, and you're rebooting once a day, how do you know removing apps made any difference? I don't see how it would make any difference. They're just sitting there doing nothing, not loaded in memory.

@shorty,
Every app that's installed consumes some of the 3G's limited 128 MB of RAM for the image of the icon on the display, and the required data structures that link to the app's firmware and data store (which are stored in the 8/16 GB flash). So uninstalling apps will free up some that valuable RAM, and give iOSlow a little more runtime memory.

Similarly, deleting any saved websites that have an icon on the home screen will release some RAM, as will cutting back on your spotlight index files, closing Safari windows, and eliminating application folders.

There are quite a bit of posts on here regarding this issue. I believe this may resolve your performance issues.

After the iOS4 update all of your Spotlight search options may have been selected. There are many more search options in iOS4 than 3.0 -

On the 3G iPhone Go to SETTINGS> GENERAL> HOME BUTTON> SPOTLIGHT SEARCH

De-select the search options you don't want (I just use messages notes). The more options selected the more processing / more is used by your phone.

Reset Phone -

Please let the forum know if this works.

Update..Settings for 3GS added.

After the iOS4 update all of your Spotlight search options may have been selected. There are many more search options in iOS4 than 3.0 -

On the 3G iPhone Go to SETTINGS> GENERAL> HOME BUTTON> SPOTLIGHT SEARCH

On the 3GS Go to SETTINGS> GENERAL> SPOTLIGHT SEARCH

De-select the search options you don't want (I just use messages notes). The more options selected the more processing / memory is used by your phone.

Reset Phone -

It works..

Message was edited by: Kasaar

My 3G became very slow with IOS4. Typing was hardly possible, many apps took a long time to start. A complete factory reinstall, as some suggest, didn't help. Finally, I downgraded to IOS3, and everything was as it used to be. Downgrading is not very difficult, see e.g.

http://www.maclife.com/article/howtos/downgradeiphone_os40

I really advise to downgrade in case of a SLOOOOOOOOOOOW IPhone 3G. My colleague has a 3GS, and hardly noticed a difference.
Apple should advise 3G owners NOT to upgrade to IOS4. As others say, they cannot take advantage of most of its features anyway!

Downgrading is a solution but not THE solution. Please try what's listed below and let the group know if this resolves your performance issues. I've applied this fix to several phones and it has worked.

After the iOS4 update all of your Spotlight search options may have been selected. There are many more search options in iOS4 than 3.0 -

On the 3G iPhone Go to SETTINGS> GENERAL> HOME BUTTON> SPOTLIGHT SEARCH

On the 3GS Go to SETTINGS> GENERAL> SPOTLIGHT SEARCH

De-select the search options you don't want (I just use messages notes). The more options selected the more processing / memory is used by your phone.

Reset Phone -

It works..

Message was edited by: Kasaar

I have now had 4.0.1 for almost two weeks, and I still consider my phone usable. Mostly. This is my tale, in case it helps anyhow.

When I got my phone 18 months ago it worked fine.

A few months ago, with iOS 3, I noticed degraded battery life. I had a local repair shop change the battery without much improvement.

With 4.0.0 my phone became unusable. Slow and still bad battery life like for so many other people.

I restored the phone to factory settings and set up as a New phone. Added a limited number of applications. Still slow. Unknown battery life, as I hardly could use the phone.

With 4.0.1, it was like a cork released from a Champagne bottle, and the speed improved dramatically. The battery life seems slightly improved, but I could not swear on it.

The speed is still, two weeks later, very acceptable. The battery life is almost acceptable.

Spotlight is on. Folders are on. 3G is on. Push notifications are off.

What I stopped doing, due to the limited battery life, is to watch movies and use the New York Times application. I read less on the Kindle App and Stanza than I did before. I have not even bothered trying to install Bento.

Mail, Safari, a couple of frequently used dictionaries, work fine. Japanese keyboard input is slower than before, but it is usable.

Your phones are probably different from mine, but hopefully some of the information above can be of some help.

Did you try the fix I posted earlier? Like I said I had considerable performance issues with multiple phones. I applied the changes and performed a reset afterwards. No real issues . I asked users to post success / failure rates but I've only seen on so far.


After the iOS4 update all of your Spotlight Search options may have been selected.

On the 3G iPhone Go to SETTINGS> GENERAL> HOME BUTTON> SPOTLIGHT SEARCH

On the 3GS Go to SETTINGS> GENERAL> SPOTLIGHT SEARCH

De-select the search options you don't want (I just use messages notes). The more options selected the more processing / memory is used by your phone.

Reset Phone -

It works..

Message was edited by: Kasaar

Lot of angry posts her but I don't see anyone verifying or debunking fixes posted. I just see complaints. If the fix below does not resolve performance issues, please let the forum know. Like I said, I have used it on over 20 devices and each of my users state their performance issues have been resolved. If this is a forum for troubleshooting the troubleshoot. If this is a forum for 3itching, then have at it. To all the real techies, please let us know it the following works::::

HERE WE EFFING GO AGAIN!

I had considerable performance issues with multiple phones. I applied the changes and performed a reset afterwards. No real issues . I asked users to post success / failure rates but I've only seen on so far.
After the iOS4 update all of your Spotlight Search options may have been selected.

On the 3G iPhone Go to SETTINGS> GENERAL> HOME BUTTON> SPOTLIGHT SEARCH

On the 3GS Go to SETTINGS> GENERAL> SPOTLIGHT SEARCH

De-select the search options you don't want (I just use messages notes). The more options selected the more processing / memory is used by your phone.

Reset Phone -

Over on TUAW a discussion on poor ios4 performance has come up with the suggestion of turning off spotlight search - and guess what - it works!

You cannot actually turn it off but you can disable all the search features. Settings-General-Home Button-Spotlight Search, and untick all the options. There is a clear improvement in my 3G performance now that I have done this.

Of course this means living without that feature - personally I never use it - but if you rely on it heavily you may not like it. Just a suggestion....