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November 13, 2009 1:09 PM PST

Can erasing your iPhone's memory improve performance?

by Rick Broida
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If you erase and restore your iPhone, does performance improve?

I won't bore you with the gory details, but recently I had cause to erase my iPhone. And by "erase," I mean venture into the Reset menu and tap "Erase All Content and Settings."

Leading up to this, my iPhone 3G was running like a snail through molasses. In recent months it had grown weirdly sluggish. I'd pick up my daughter's iPod Touch and be shocked at how much faster it was.

After the nerve-racking process of wiping the 3G and letting iTunes restore the backup (it was the first time in a year of iPhone ownership that I'd had to do this), I noticed something: It seemed peppier. A lot peppier.

I'm not sure why, but this definitely begs the question: Should iPhone owners perform this step every few months? Does the wipe-restore process somehow defrag the device and thereby optimize performance?

I honestly don't know, but I reckon you, our brilliant readers, can offer some insight. Am I crazy? Imagining things? Or right on the money? (That'd be nice for a change.) Share your thoughts in the comments.

Rick Broida, a technology writer for nearly 20 years, is the author of more than a dozen books. In addition to writing CNET's The Cheapskate blog, he oversees BNET's Business Hacks. Rick is a member of the CNET Blog Network and is not an employee of CBS Interactive. Disclosure. Deals found on The Cheapskate are subject to availability, expiration, and other terms determined by sellers. Follow Rick on Twitter at cheapskateblog.
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by legatoblu November 13, 2009 1:43 PM PST
every now and again i have to restore the iphone to factory settings to keep it running smooth. i usually do it every 3-4 months on my iphone 3g 16gig
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by Zombittack November 13, 2009 2:01 PM PST
I have had mediocre results with restoring a backup. After the past few updates I had a considerable decrease in battery life. I fully wiped my iPhone 3G and started over thinking maybe there was junk I'm the background from an old jailbreak or something. The full wipe did nothing but remove all of my saved games and app settings. It didn't help a thing. I have since concluded it must be a change in my use. I have been downloading apps like mad and I use them throughout the day. I do have to recharge whenever I can get it but also whatnanyone would classify as a heavy user. My battery gets close to dead after about 3 hours of music, 2-3 hours of surfing, and an hour of gameplay. I haven't noticed any decrease in speed but I do periodicaly restore my phone it may not get as bad as the authors.
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by DistortedLoop November 13, 2009 2:14 PM PST
Interesting that you restored your backup and noticed improved performance; it's almost always advised that you do a wipe and then fresh install of all apps and settings. I can't imagine what you accomplished, but it shows that sometimes these hi-tech toys are just like black-magic, some things just can't be explained rationally. ;-)
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by tipoo_ November 13, 2009 2:50 PM PST
Look up the TRIM command for Solid State Drives...Seeing as the Iphone also uses flash memory, you might be seeing a similar effect.
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by Garibaldi53 November 14, 2009 3:34 AM PST
I did a reset last night. Wiped everything and reinstalled as a new phone not using the backup. It was a bit of a pain reinstalling all the music and apps and rearranging the icons and settings but there is a noticeable difference in speed and báttery life. It has pepped up considerably.
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by DistortedLoop November 14, 2009 5:44 AM PST
The difficulty for me in doing a full wipe and clean start is that Apple doesn't let you backup/restore an apps' data selectively. Wipe your phone and something like your gas mileage tracker loses two years of data on the phone without a restore. Most of the better apps now allow you some method of backing up and restoring user-specific data within the app, but if you've got dozens of apps with trackable data you'd rather not use, this becomes a real pain in the butt, especially if you need to do it periodically.

While the upside to sandboxing every app with its own /documents or data directory protects you from having one app steal information from another, it also prohibits you from backing up your data in a manner to make it handy to restore in reinstall of the OS. Despite being a handheld unix computer, they've really dumbed down the iPhone for the lowest denominator of users, with no easy options for more knowledgeable users to get things done more efficiently.
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by CrashPad63 November 14, 2009 8:24 AM PST
How bout erasing the Iphone out of existence? That would improve everyones performance.
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by myles taylor November 14, 2009 1:26 PM PST
Oh how mature. You know, there are a lot of people who like the iPhone. Whatever your personal feelings for it, why do you want to take something away that other people get a lot of use out of?
by cspyker444 November 16, 2009 7:44 AM PST
Great thanks to the author for this idea for better performance. Not so much though from this guy. I think in the classic "there's an app for that" mentality, we should have an app to erase iphone haters. It has been one of the best phones I have ever owned as a technology professional. Even if I feel a little like a lemming.
by CrashPad63 November 16, 2009 1:16 PM PST
@myles,
You like being baited along like a sheep to slaughter? You do know that Apple is the biggest xerox company going right now, they innovate nothing, and overhype everything.
Overpriced, overhyped and bad copies of existing platforms, why? Why would you even defend this?
by myles taylor November 14, 2009 1:26 PM PST
That's interesting. I've been noticing that my phone has been running slower lately. I might just do a wipe and see what's going on.
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by myles taylor November 15, 2009 3:17 PM PST
I tried it and it does seem like it's working faster. Glad I did it. :)
by saurey1 November 15, 2009 7:59 PM PST
I do that every time I jailbreak w/ new OS-version/firmware update. Takes about 2 hours to wipe, then I do NOT restore from backup but do as new phone, performance goes way up.
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by Jboggie619 November 15, 2009 10:07 PM PST
Not great results, not all apps or music was restored. sadly i have just found out the inconvenient truth behind these so-called "backups," they really suck. iPhone restoration is a SLOW, and incomplete process even though i'm doing everything by the book. I think this tops work as my least favorite thing to do. Thanks Apple and iTunes, go eff yourself.
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by Kiai808 November 20, 2009 2:12 PM PST
There's an app called Free Memory from ressessionapps.com that I have which clears all non essential background apps. Normally your supposed to have 40-50 megs of ram free. My phone was running sluggish and someone suggested this app. when I first ran this app, it said I had 3 megs free. after running the app, I had like 45 megs free and my phone was fast again. now I free up memory every day. So perhaps freeing the memory is enough instead of wiping your phone all the time.
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