French carrier SFR warn users that iOS4 'significantly slows down' older iPhones?

iPhone headaches continue, this time French carrier, SFR, is warning iPhone 3G users that iOS 4 significantly slows down their device, while Apple promises to fix the speed flaw and potential fixes emerges from out of the chatter.

SFR Info: updating of the iPhone 3G to software slows significantly iOS 4 navigation menus. Any update is irreversible.
This information concerns only the iPhone 3G and not the iPhone 3G.

In brief: story is that 3G and 3GS iPhone owners have seen their device speed slow considerably on upgrading to iOS 4. Apple is preparing a patch for this...

Various tip sites say to clean out the Spotlight options, but according to our commentors, that doesn’t work so well.  Others have had luck with Hard Resets every few days.

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