Yes and yes.
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1]K (?ofL|Cg( Based on Apple, yes, you can run iOS5 on 3GS.
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According to review "switching too frequently between 6–10 apps throughout the day can slow the whole device down". Don't run too many apps or purge apps to free up RAM sounds like the solution.
Z*Lv!6WS If you prefer to run multiple apps, then updating to iOS5 may not be that great.
vyhxS .[9 Don't forget that you will also need to spend time to JB your iOS5.
yN/Uyhq .E/NlGm[ JB for iOS5 is released already,
http://www.iphonehacks.com/jailbreak-ios-5 .ng:Z7 Redsn0w version 0.9.9b5
[ 此貼被acdv在2011-10-14 09:09重新編輯 ]