xcode 9 (9A235) horrible performance...

Xcode 9 Storyboards are a Disaster! It takes 93% of CPU. My mac is macbook pro Retina 2014, i7.

I've been able to remediate storyboard performance by refractoring a single storyboard (~1.3 MB) into multiple using the "Editor -> Refactor to storyboard..."

It seems that if the storyboard files are under ~250 KB they are more responsive. Those under ~700KB are tolerable but still slow. I'm also observing edits to pre-existing scenes in storyboards seem to have delay while new scenes perform as expected with no hestitation...

UPDATE: Performance for the storyboards over 250KB is still a huge problem. Every change invokes a 30-60 second pause and wait wheel. Arg!

Xcode 9. Its horrible. I was about to hit on my macbook Air. which was smooth with xcode 8.3.3

Just tried Xcode 9.1 beta, Storyboard hangs with beachball spin on almost anything i clicked on.

Any idea whats wrong? It has gotten so bad that just leaving the storyboard to go to any other plain swift file

also hangs!!

"I have to use last release Xcode 8.3.3 to edit code and then use Xcode 9 to compile for new iOS 11 features.

Ditto! Facing the same issue! Slow and sluggish!!! I have to install 2 xocde costing my disk space! 😟 😟

Same here. Feel your pain.. Not productive.

.. it seems to be an autolayout issue. I turned of autolayout for the biggest ViewController and was able to work again and postpone the constraints for the hopefully next better beta relase,

I am having the same problems that others have stated that are happening to them. I was accustomed to slow launches of iOS apps in the simulator, but my Cocoa and command-line apps have always compiled and run at a faster speed for years (or even faster, when I have upgraded to more RAM and faster processor.) Another problem is that in editing mode, I can get a 30-second delay even when all I've done is place my cursor at some part of the page. This is particularly bothersome in light of the fact that Apple represents Xcode 9 as an improvement over the previous version. In addition, Playgrounds run more slowly, when they run at all. I have followed several threads on this forum regarding that issue, and Apple's response to that issue is that Playgrounds work just fine for a majority of users. This is unacceptable. Software isn't created for a majority of users, but rather for every user who satisfies the system requirements stated by its authors before installation. I notice in this thread that no Apple representative has weighed in on this issue. I hope and expect this to change, if I am going to continue to develop on this platform.

.. tried Version 9.1 beta (9B37) and activated autolayout again.

Same issue. No improvemt. Storyboard produces delays of 30 sec, even just for scrolling a tableview. It is definitly the autolayout system in my opinion.

Toggle off autolayout and you can at least add some inputs.

This is a major issue. How should all the developer of big apps maintain their code?

Same here. Both xcode 9 and xcode 9.1beta, the interface builder is super slow in attempting to render the storyboard. Keeps on spinning and hogging the memory. This problem does NOT happen on xcode 8.3.

Any suggestions on how to solve this?

>xcode 8.3

At least 9 is approved for store submittals 😉

https://forums.developer.apple.com/thread/76623

Same. Also extremely slow autocompletion. MacbookPro 3.1 GHz i7, 16 GB RAM

This is a discovery for me. I also experience very slow performance in storyboard until I stumble on testing out for iPhone X. If I set my device in storyboard to iPhone X, everything is snappy. Opening a storyboard is immediate and adding UI component is fast as well. Sounds like Apple really wants us to build for iPhone X. Hope this helps everyone with similar issue.

Same here, we are currently with waiting for periods of 2 or 3 minutes every time we change a configuration or every single click.

Doesn't happens in any other previous version...

It is impossible to work with this version of xCode!

Noticed two things: it's faster in projects where is no objc/swift mix, and if project is converted to swift 4