Does jailbreaking really slow down your phone? Any technical information?

Discussion in 'Jailbreaks and iOS Hacks' started by sofakng, Oct 27, 2010.

  1. sofakng macrumors regular

    Dec 5, 2008
    Is there any solid information on whether or not jailbreaking slows down the phone?

    I'm a software developer (although nowhere near the level of the dev team, et al) and can't think of a reason why the jailbreak itself should change anything. If anything it should be faster (because it's not checking if code is signed) but everytime I jailbreak I swear my phone gets slower and that's even if I only load a few emulators, etc.

    Even if the jailbreak itself doesn't cause any slowdown, how about Mobile Substrate and 3G Unrestrictor, etc? If I understand correctly these are basically wrappers around different sections of code so I can see them causing a very tiny bit of slowdown.

    I'd still love to see any information from somebody with a technical background, etc...
  2. Intell macrumors P6


    Jan 24, 2010
    Jailbreaking by itself with nothing from Cydia installed? No. With stuff from Cydia? It's possible that there could be a slight slow down. However, since the iPhone 3Gs the slow down has been so small its almost like there is no slowdown at all. But, if you install something that was not made for your firmware version, it could make your iDevice very slow.
  3. LoLife macrumors regular

    Jun 1, 2010
    Reno, NV
    In my opinion I see a very slight slow down in various ways but with all the stuff I think it is worth it. And it is so mininal you wouldn't really be able to tell without nit picking. I did run a test through speed test before jailbreak, after jailbreak and after I installed some programs and I saw no decline in the speed of my iphone. I think that if you install a ton of stuff from cydia naturally it is going to slow down the phone I would think due to memory problems. If you only have certain things and delete the stuff you don't use I don't think you'll have a problem
  4. maturola macrumors 68040


    Oct 29, 2007
    Atlanta, GA
  5. -aggie- macrumors P6


    Jun 19, 2009
    Where bunnies are welcome.
    Most people won’t notice any lag from jailbreaking. Even with some lag, the advantages win over the slight lag someone might notice. Of course, if Apple implemented a lot of the stuff we have to add, we wouldn’t even have that lag.
  6. sofakng thread starter macrumors regular

    Dec 5, 2008
    Why does the lag even exist? That's probably the root of what I'm asking...
  7. hokiepokie07 macrumors 6502a

    Jun 20, 2009
    If you have a background that is moving, that could slow your iPhone down a tiny bit.

    I don't notice anything different on my iPhone.
  8. siorai macrumors 6502

    Sep 14, 2007
    There is only so much processor power and ram available. Start pushing up against those limits and you get lag.
  9. Gizmotoy macrumors 65816


    Nov 6, 2003
    Many Cydia applications run all the time (Winterboard, etc.) or when certain events occur (BiteSMS, etc.) so you're running additional code that wasn't there before.

    Additional code = more CPU cycles, RAM, and so on. The more unused RAM and CPU cycles that are available, the less you'll notice any slowdown caused by jailbreak apps.

    I could drag down my 3G pretty easily, but my iPhone 4 remains pretty responsive. I didn't notice any performance hit at all.
  10. OasisNYK macrumors 6502

    Nov 29, 2004
    With the 3G i noticed lag and battery drain - but I was also running winterboard and some themes.

    On the 4 I do not notice any slowdown, and the battery has been great.

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