Xcode 8 Editing very slow

How much free space on your drive right now?

Sounds like a bug in Xcode. We can't be sure until we investigate though.

Please file a new problem using bugreport.apple.com You can gather the information we need by running `sysdianose Xcode` in Terminal while the Xcode is being slow.

Same problem here and I have 900 GB free Space on a 1Tb Fusion Drive with 16 Gb ram. On xcode 7 it was amazing speed on storyboard, now I can go to take coffe while opens it every time i change from text editor to it.

I have this problem too. Extremely slow syntax highlighting, editing, replacing in global search, etc.

I have 90Gb free space on my MBPr 13" 2015 SSD.

The same happens to me. is impossible to work , it remains dumbfounded 10 - 15 minutes.

311.39 GB free

16 mb of RAM

xocde 8

what append?????

Concur with lindner514.

I'm seeing huge performance drop-off of Xcode 8 vs old Xcode 7. (I didn't download the beta's as running production code and waited for GM - lesson learned here.. should have tested earlier on 8)

IDE syntax highlighting is also slow, and the whole user interface is generally laggy. Seems to be Indexing the project more often, and chews the laptop battery quickly (fan kicks in when compiling)

Need to somehow roll back to Xcode 7.

* bcallaha - 'sysdiagnose Xcode', left out the 'g'

29.79 GB free disk

16 GB RAM

MBP 15", mid 2012

I have the same problem. XCode is really crashing every 5 minutes now. First while editing you notice it cannot keep up with the intellisense and makes my Macbook take off like an airplane. After a few minutes Xcode hangs and I need to kill it and restart.

Is there a workaround? because like this I cannot do my job.

I have the same issue with XCode 8, does it seem to be stuck on building/indexing everytime you type something in the editor?

I've tried to clean the 2 following folder and it seems to speed the build/indexing up. Not as fast as Xcode 7, though.

~/Library/Developer/Xcode/DerivedData/*

~/Library/Caches/com.apple.dt.Xcode/*

I'm also seeing the same issue with Xcode 8. My problem happens more so when I try to change tabs and get the beach ball of death.

325.79 GB free disk

16 GB RAM

MBP retina 15", mid 2015

2.5 GHz intel Core i7

Same problem here.

Writing just 2 lines of code then whole editer turned white.

Recompile everytime.

120GB free disk

16 GB RAM

MPR retina 13" late 2013

2.4GHz intel Core i5

The same here,

I tried to reinstall but still Xcode freezes on indexing. My project is a object-c with c++.

Was working fine in Xcode 7.3.1

120GB free disk

8 GB RAM

MPR retina 15" late 2012

2.6GHz intel Core i5

Same problem here. It seem that the code syntax highlighting is taking forever. By checking the Activity Monitor, I can see that the SourceKitService takes over 100% of CPU.

just got the update to Version 8.1 (8B62) ... still not fixed

Just to echo that 8.1 is very slow on my mid-2015 MacBook Pro retina 15" with 2.8GHZ i7 and 16 GB RAM with 74GB on SSD drive available. Can't believe a machine I bought less than a year ago is too slow to run Xcode 8.

I'm having the same problem, yesterday I've fully formatted my iMac and Xcode still can't load a nearly empty storyboard!!

Mid-2015 iMac 5k

Intel Core i5

3,3 GHz

32 GB Ram

960 GB HDD still available..

I didn't have this problem until today. Last time I used Xcode was 5 days ago and it was running fine.

I can't believe this problem is still unresolved since September!

Very frustrating.

I'm running Xcode 8.2 (8C38), and I can confirm that there has been no fix. I can't even use Xcode anymore. I barely type anything, and all text turns white and autocomplete never shows up. I don't even know what to do at this point. :-(

I am facing same problem with my Xcode8.0. Its very difficult to code with such slow IDE.

just got the update to Version 8.2 (8C38) ... still not fixed

Facing the same issue with version 8.2 (8C38) - latest build of Xcode 7.x did not exibit this behavior. This is general across the board while editing either a source file or a interface builder file. Xcode becomes unresponsive for at least 5-10 minutes, then decides to allow one click, then hangs again for another 5-10 minutes. An endless loop.

[UPDATE]: Found out that by disabling "Use Trait Variations" on the XIB files the performance returned across both the source files and XIB files. Though this only happend after I watched my views "dance". Literally in real time the widgets in the parent view bounced back and forth within the viewable bounds for a minute. The most bizzare thing I have ever seen developing an interface.

[UPDATE]: Additional performance boost to almost no delay was setting "Top Bar" and "Bottom Bar" to "Inferred" rather than specifying an option. When anything other than "Inferred" was selected, Xcode came to a halt. This is definitely a bug within Xcode and degrades the IDE functionality.

Same issue here, Version 8.2.1 (8C1002). 30 Gigs free harddrive, 8 gigs Ram. It's taking upto a minute to identify a syntax error (typing fals instead of false for example). EXTREMELY painful to work with.

Upgraded from 7 last night, prior to the update I had no issues and had zero lag.

I have a similar issue, and found a solution on StackOverflow that seems to be working for me. (http://stackoverflow.com/questions/41455511/how-do-you-get-xcode8-to-respond-faster?noredirect=1#comment70117716_41455511) which is the Q/A I posted earlier today. In short, add a UserDefined Setting to your project as:

SWIFT_WHOLE_MODULE_OPTIMIZATION = YES

This gave me an immidiate solution to my lag issues. I can't explain the how or the why, but I'll take the fix so long as it doesn't revert back tomorrow!

Same thing here, Xcode 8.1. I have tried the following solutions:

http://stackoverflow.com/questions/26151954/sourcekitservice-consumes-cpu-and-grinds-xcode-to-a-halt

http://stackoverflow.com/questions/41455511/how-do-you-get-xcode8-to-respond-faster?noredirect=1#comment70117716_41455511

http://stackoverflow.com/questions/36212368/xcode-7-3-is-excruciatingly-slow-when-loading-storyboard-ib

Macbook Air Early 2015, 80 GB free, 4GB RAM (But I don't have anything else opened when working). Bought new at the end of 2015. It's impossible to go from the swiftness and greatness of Xcode 7 to this miserable version. The XIB file I'm trying to open in Xcode 8 is simply frozen, I can't tap any button.

However, I confirm the "Top Bar", "Bottom Bar" bug! I switched to Inferred and the IB is smoother now. Still, the overall experience is quite bad, the lag is clearly visible from the previous versions.

I also have the same issue. My xCode is 8.2.1 (8C1002). It consumes too much time when compiling to device. But it s normal in simulator!

Same here! Why hasn't this been fixed yet..Apple come on!

Version 8.2.1 (8C1002) Xcode becomes very laggy after project build for both device/simulator.