My experience was that it handled having low storage space (Less than 400MB free out of 16GB) less well than 3.1.3.
Once i freed some space the odd app crashes seemed to stop.
Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
21–30 of 35 posts
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#22It is completely unbearable on my 3G. I did install a jailbroken rom which has multitasking enabled, however it seems odd that "Backgrounder" ran apps just fine yet iOS4 cannot.
Oh well back to 3.1.2 for me.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#23Strange. I have a 3G and 4.0 feels slightly faster compared to 3.1.3. Did you jailbreak it and enable multitasking + extra animations?
On the other hand, multitasking helps with apps that take forever to load since their state can be saved/loaded now. Work out the cost/benefit in your case.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#24My 3Gs works just fine after upgrading to iOS4. I agree with @thought_alarm's comments regarding the lack of memory being a likely candidate cause.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#25Mine is now very slow at getting back on wifi at home after the phone went to sleep. That's annoying!
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#26I had the same problem with 3G and iOS 4.0, but after a hard reboot it became fast again (Hold the sleep button for some seconds, and push the slider). It took me almost a week to figure it out (during which the phone was next to useless), but now it seems as fast as 3.x.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#27Same, with both the upgrade and a full restore, and my phone is stock (no jailbreak.) A good friend had great success with his after iOS4, so it's not affecting everyone. I followed a guide online and manually rolled back to 3.1.3 and haven't looked back, and soon I'll pick up the 4G. It's not like most of the compelling features were compatible with the 3G anyway.
Do you by chance have a link to this guide?
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#28Your device is slow because apps are constantly triggering low-memory conditions. Memory was very tight on the 3G, even before iOS 4. This is precisely why multi-tasking isn't enabled. Safari alone is consuming most of your device's memory, by a very large margin. It stays resident in memory when you return to the home screen, and it's one of the last apps to be killed in low-memory conditions. The problem is that mu…
You can also kill Safari (and all other running apps) by holding the sleep button until it shows the slider screen, and then hold the menu button until you get the home screen.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#29Mine is now very slow at getting back on wifi at home after the phone went to sleep. That's annoying!
I heard that one of the updates for ios4 is that it would maintain a wifi connection when put to sleep.
Re: Tell HN: My iPhone 3G is unusably slow since upgrading to iOS 4.0
#30If you have data on the phone, like texts, emails, etc. your iPhone 3G will be unusable. Mine is also terrible, but I'll live with it until I make a fresh install when I buy an iPhone 4.
I'm also having a really slow experience. I guess I have a lot of texts, emails and photos (thank the interface lift app for that).
The problem is that it wasn't this slow with 3.x, yet I've really not gained any extra features, so it's basically a downgrade.