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I don't see any slowdowns with any iPhone I've ever jailbroken. As far as your battery stats go, it is keeping them. When you have a **** app and your phone respings it loses your battery stats. There is no noticeable slow down at all. There are plenty of apps out there that are as polished as anything apple has made, or anything in the app store. Hell, most of iOS 5 comes from cydia. To name a few, the new way a message comes in(mobile notifier), wifi symc(called wifi sync in cydia), intelliscreen X, or lockinfo(notifications on lockscreen), he'll even cydia had the ability to make the original iPhone record.
Take zephyr for exampl. Great little app. Considering the problems that the iPhone 4 had with the home button, and who knows, maybe the 4S it's a huge thing to use gesture to change apps, multitask, and close them. This is something that is implemented great on iPad, but apple couldn't figure out how
To do it on iPhone. The JB community did! Instead of using 4-5 fingers. Use one or two!! So simple.
I agree that JB can screw your phone up badly(or make it behave poorly) but that's why you take the time and do it right. If you read up, and be careful what you install, it will be no different
Than any other app you install. Period.
I didn't say all the apps were bad, I said a lot of the apps are bad and that happens to be true.
Please don't tell me that my battery stats are working. I think I know better having my phone is in my hand and I've charged it to 100% a number of times already.
You also can't make a blanket statement that jailbreaking does not affect performance. I have seen this with my own two eyes on my iPhone 4S. After jailbreaking and before adding any new apps, scrolling through settings the screen stuttered.
No two iPhones are exactly the same. Why do some apps work well on some phones while others cause issues for their owners.
Why is it that some iPhones have good battery life while others are terrible. If the phones are identical then every one should perform exactly the same. But that's not the case. You can find threads all around here about how people are having problems with some apps yet the replies say the app works great.
Same thing in the app store in the reviews. You see one star reviews where the primary complaint is a crash. Then you see five star reviews where there is no crash complaint.
Every phone is different and what works for you may not work for someone else.
It's also not fair to say that Apple "couldn't" figure out something like Zephyr. I tried it and didn't dig it all that much. I liked multiflow better. See? To each his own.
That's part of the issue, that people keep wanting more and more. It's not good enough how Apple did it, it "needs" this or that. So far as I can tell Apple's been doing quite well with their OS.
I choose to enjoy what I have without looking for things that aren't there. Do I come across something I would prefer to be implemented differently? Sure I do, but I don't let it rule my emotions. There are so many different solutions to almost every problem that it's not worth lamenting the missing function.
That's probably a whole other discussion so I'll just leave it at that.