IOS4 Upgrade Questions

Hello,
Im considering upgrading from iPhone OS 3.1.2 on my iPod Second Generation to iOS 4. I have many apps which store information (eg. game saves) which I can't retrieve (eg. save to my PC). Will I lose this when I upgrade? Are the things ive heard about the iPod being so slow its unusable after upgrading true? Are there any major risks involved in the update?
Thanks,
Nz26

The iOS 4 update differs in that it will erase your music, so be warned.
Your game saves are usually saved as part of your backup.
Temporarily disconnecting from the internet may speed up your backup a little since network activity seems to throttle it for some reason. But make sure to reconnect before it finishes because iTunes needs to connect to Apple to do the update.
There are reports of iOS 4 being slower on older devices, though the 2g is faster than the original iPod touch and iPhone 3G. The 4.1 update coming out on the 8th is supposed to alleviate that.
As always, make sure you have a backup before doing an update.

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