Slow iPhone 3G after iOS4 install? Do a restore

[hariustrk]

I did this last night, and aside from having to reinstall all my apps/music. I am much happier. The phone is alot snappier. Not sure what was fixed, but it did work for me.

I am skeptical though on the long term, since my probably seemed to get worse over time. We shall see.

 

[Davvido]

Erase all your data and settings as well - it really helps.

 

[MorganK]

I did this a few days ago and am still having the same problems as before. I've seen several people here report it sped things up for them though. Might be because mine was trying to die before iOS4 (freezing up, etc). Finally broke down and ordered a new phone last night.