Iphone 3G slow after update to IOS4

I have a 3G and also noticed a real slow down. I use an app called 'Scan Lite' which shows and allows you to reclaim memory. I noticed some interesting things going on......

1. There generally seems to be less availale memory under iOS4 than with 3.
2. every time I open an app for the first time, my available memory drops and inactive and active memory rises. If I close the app and open it again, memory usage stays about the same.
3. If I open another app, memory drops further and inactive and active memory rises further. Same again, if I open the app for a 2nd, or subsequent time, memory stays about the same.
3. Memory continues like this until you run out of memory.

THOUGHTS:
1. It seems to be a memory management problem.
2. When an app is closed, is iOS4 trying to minimise into multi-task mode, failing (because it's a 3G), and not freeing up memory?
3. iOS4 DOES generally slow down the 3G anyway - it has more functionality and therefore takes up more system memory to run. If you delete apps that you don't use very often, the 3G does speed up....slightly.
4. Can Apple disable functionality on the 3G, like multi-tasking, so that it does not even attempt to use system resources - as oposed to what I think is happening, which is; running the process then testing if it can be used. That way, the 3G is not running (or even loading into memory) functions that cannot be used on the phone.

iOS4 has killed the 3G. It's not worth upgrading on a 3G.

Can't wait to get my iPhone4 🙂

Scan Lite has been renamed to Memory Sweep (by Gary Fung). The app has the same icon, so I presume this is the new app name.

I have 2x 3G 8GB and an iPhone 4. And when it was running at IOS4 it was dog slow. I can help most of you by telling you to go in to your Settings -> Spotlight Search, and unchecking ALL the items listed.

Just like on Snow Leopard and Windows Vista. While it's a nice feature to be able to find something "really" fast. This just eats up a lot of resources on your 3G and below phones. Anyone here with a Mac will know what Spotlight Search is. For you Windows folks, it's basically turning off Indexing on Vista.

Hope this help some of you pooooor folks

Message was edited by: mbze430

it's time to get an appropriate update from Apple !
my i-phone is not working properly any more since the update to IOS 4

I also have the 3G iPhone with 4.1 running. The phone is definitely slower at times, some apps crash. Has anyone else realised that the 3GS with the same OS upgrade features 'active apps' found by double clicking the home button and a window scrolls up from the bottom of the screen showing all open applications....iPod etc. It would appear that to speed up re-visiting apps they are not fully closed at 4.0 +. This is fine when using a 3GS as you can access the active apps as described, long touch to display a '-' sign next to them and close them. Without the ability to do this (3G) apps are simply left open and eventually impact performance.....so the question is why 3G phones do not have the same ability to close active apps that 3GS phones do?.......does anyone concur with this idea?