Xcode is unbearably slow (and lies). Why?

Question

My Xcode compiles are taking longer and longer.

Each time I compile it claims it's compiling one file in the Activity window even though I would not have editede it and it has no dependence on the files I'm editing. In the Build window it claims it's compiling another file (the right one).

I have tried cleaning, precompiled headers are in place etc..

This is Xcode 3.2.2

Why is this happening?

@Joe Blow. It's only doing this on the one project. Other projects compile fast — John Smith, Jan 07 '11 at 00:39
You may want to try this simple trick: http://stackoverflow.com/questions/6355667/xcode-4-slow-performance — paiego, Apr 24 '12 at 20:40

score 1 · Answer 1 · answered Jan 06 '11 at 15:27

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I had a similar problem and I tracked it down to a choppy/really slow Internet connection. Disabling the internet connection by shutting off the wi-fi would make the compiling fast again. The final solution was to stop using my neighbour's wifi and get my own (<- Joke ... not really ... jaja :/)

I'm not sure what is XCode doing over the Internet connection, but with a poor connection some sort of timeout seemed make the building process VERY slow.

This may not be your problem but it is easy enough to test. Cheers!

answered Jan 06 '11 at 15:27

fsaint

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Even if that's a problem I will have a bigger problem to deal with. Does apple expect me to code without internet access like in a job test? – John Smith Jan 06 '11 at 15:55
To my experience with Internet and without Internet is fine. The problems I experienced was bad access. My poor connection made the computer believe it had Internet access but connections would timeout frequently. – fsaint Jan 06 '11 at 16:11
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Big question is why Xcode is sending data over the internet when you're compiling something. – Kalle Jan 06 '11 at 17:55
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XCode supports distributed compilation so it could be the process of looking for other nodes to compile on was slowing it down. – Kendall Helmstetter Gelner Jan 06 '11 at 18:37
Disabling the network adapter sped things up for me. Then, after re-enabling the adapter, it stayed at a good speed. thanks Felz – Fidel Aug 18 '11 at 13:45

score 1 · Answer 2 · answered Jan 06 '11 at 15:42

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Quite often, problems like this can be fixed by going into your application directory and deleting the BUILD directory. X-Code automatically generates this directory upon compile anyway so you won't lose any data, it just cleans things up a little and MAY allow you to compile quicker in the future.

Source: Alan Cannistraro, Stanford University on one of his iPhone Developement Class Podcasts

answered Jan 06 '11 at 15:42

Dan Hanly

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Sorry i couldn't help your issue, there was always a chance that it'd help :) – Dan Hanly Jan 06 '11 at 17:42

score 1 · Accepted Answer · answered Jan 07 '11 at 07:08

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Which hard disk is your project on? Could it be a slow drive and/or a full disk kind of issue? I presume its not a networked drive...

What does the Activity Monitor show - is the machine 100% busy CPU-wise or not?

answered Jan 07 '11 at 07:08

Chris Kimpton

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Very close answer (in retrospect). I discovered the hard way that it was a dead drive. It was having problems reading certain sectors and thus very very slowv. – John Smith Sep 26 '11 at 13:42

score 0 · Answer 4 · answered Jan 07 '11 at 12:07

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Try and update XCode? (do not read the following : answer needs 30 characters, so I fill my answer with this sentence)

answered Jan 07 '11 at 12:07

moala

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Xcode is unbearably slow (and lies). Why?

4 Answers4