xcode 9 (9A235) horrible performance...

Same issue here. It freezes often and slow in general. Can't work on my projects, can't believe apple released such a buggy version. Waiting for the update now. Not sure if possible to downgrade to v8.

Same issue for me here. Terrible performance with XCode 9.2 still on my MacBook Pro mid 2014... Is there any solution to this or we should buy a new mac? For God's sake...

I finally shot myself and upgraded to a new iMac i7 5K with SSD and 40G memory. I guess this is Apple's sucky intent. Things run faster, but not a lot better. No more stalls. I still have to quit xcode every 1 to 2 hours, erase all caches, erase derived data, reset all simulators. If I don't things just quit working right. My number one complaint now is that sometimes errors just show up and won't go away. My project compiles, runs in the simulator, but still shows fatal code errors in xcode. Only a reboot seems to fix it. Usually I fugure this out after spending a lot of time before I realize the error is impossible.

I did notice that Xcode for my projects seems to want about 12 to 14 GB of memory. Thats all swift and about 200,000 lines of code. I'm guessing that it is no longer possible to develop code with anything less 18 to 20 GB of memory, expecially if your run any simulators.

Something is seriously wrong with Xcode/macOS and no one seems to care.

I agree, performances are terrible, especially on storyboards. I don't even talk about the simulator. Paying 99$ a year we should have a better tool.

Hi Quincey

I think people are frustrated and venting here because bug reports seem to fall on deaf ears (plus they all take a non trivial amount of time to produce) - some Xcode bugs have been around for ages. The baffling thing is that it only takes a few minutes of actually using Xcode to discover many of its shortcomings - surely Apple can see this and delay releasing until things 'just work' like they used to? For a company the size of Apple, to just release without doing UX testing seems rediculous because all it ends up doing is to dent Apples' reputation even further - just look at the bad comments for Xcode on the AppStore.

All we want to do is to spend our time writing software for our own apps - not producing endless bug reports for things that Apple should really be able to discover for themselves after just a few minutes of their time...

If your mac is also slow, try applying first aid to Macintosh HD

Go to : Launcpad -> Utilities -> Disk Utility -> Macintosh HD and then click First Aid to proceed.

(Your computer may not respond durring the operatin. Don't worry It's compelely normal! 😝)

Hi, It´s impossible to work with this version of Xcode on Sierra 10.12.16 . Any solution?

Look like this help for me...

I've been waiting enough to see any porgress but that's in vain... Horrible performance of my Macbook Pro (mid-2014, 16GB RAM) when XCode is running. It is really awful. Very frequent crashes, rainbow wheel etc. I guess Apple is pushing us to an upgrade. XCode 8 was really smooth but since the update to 9, everything is really bad and the worst is that our productivity drops with so many issues every day...

Same. We are experiencing terrible performance issue with xcassets by version 9.0 onwards. Now We are using the latest XCode 9.2(9C40b), and still the issue is there. Hope apple will fix the issue on Next release.

Also, anyone noticed that when running playground two deamons run (diagnosticd) that eat up CPU like bananas? Even after I kill playgrounds and cycle power on the mac these continue to run and **** the life from the mac. It runs that way on all my macs (a variety of iMac, mac pro, mac books etc.) So seems pretty consistently bad. Only way to get rid of the processes is with lauchctl stop <daemon>

Quality stuff Apple, no really, a great scheme to get me to buy another battery (or was it new Mac? I forgot what your plans were). Sorry for the sarcasm but hey, they are not listening anyway...

If you quit Safari while using Xcode it will help you.

Still the same problems with 9.3

It's been over 6 months since first 9.x released, 9.3 has just released and this editor still ultra-mega horrible on my MacBook Pro 13" 2015. I used Visual Studio, Android Studio, even on Eclipse have never seen anything like that. I'm serious man, Xcode 9.x series by far one of the worst editor ever in history.

I don't wanna pay 99$ per year for get headaches for every hour! Whatever i tried, nothing works. Still, still, still epic bull****.

Performance is still really bad in XCode Version 10.0 beta 2 (10L177m), it was also poor in XCode 9.4.2 on same machine.

What i have noticed though is at times when I thought auto complete was not working when in fact it was just really really delayed. From testing it seems the more code you have in your project, file, or method the worse things get. The more swift syntatical sugar you use the worse things get.

I had a file that was about 275 lines long and in one method I used the nil coalesce operator (??) a bit and XCode just came to a hault. Once I commented out the lines with the ?? operator auto complete started working again. I had deleted derrived data, restarted, turned off show errors as I type, nothing would save SourceKit.

Basically if the only apps you write are demos for WWDC keynotes your expierence will be stellar with XCode. If you try and use it as an actual IDE to ship production code for your business you will hate your life.