Xcode 8 Editing very slow

Same problem - MacBook Pro (Retina, 13-inch, Early 2015) 2.7 GHz i5 8GB running Xcode Version 8.2.1 (8C1002)

Same problem - iMac (5k Late 2014) 4 GHz i7 32GB running Xcode Version 8.2.1 (8C1002)

bcallaha,

With a completely new machine, a 15" Touchbar MacBook Pro from late 2016, these are some of the issues i'm experiencing:

• Random errors when running on device (An unknown error occurred)
• Debugger breakpoints on the wrong places, printing out statements is SLOWER than recompiling the entire product
• Simply typing in the Xcode editor is slow. Each character comes with a few ms to a few 100 ms delay
• Autocompletion is effectively useless seeing how slow it is
• Xcode keeps recompiling not only the current target, but also its dependencies, even though no changes has been made
• Xcode crashes randomly, and inconsistently several times per day
• Scrolling through code is laggy, even on a low-resolution screen
• Animation of opening and closing panels never exceed 2-5 fps
• Xcode stating that devices are locked, when they in fact are not

I could go on forever about how the developer experience in Xcode has become so terrible, i sometimes feel like stop developing for iOS as it just keep going downhill. About filing a report on bugreport.apple.com – my radar about Simulator performance took months to even get a reply – i doubts that i will ever get a response on it.

Feeling quite pesimistic about the future of development on Apple platforms if you cannot even resolve issues regarding developer experience.

You're not even that responsive in the forums – sounds like the chain of communication up to the actual Xcode developers is broken.

I'm upset, especially since there are literally thousands of us who could help with the Xcode issues.

Just started having the same problem, like hitting a brick wall. The editor became unusable. Tried exiting xcode & restarting but slowness persists.

The slowness seems to be related to the length of the source code file. The editor is very slow when editing a .m file with about 6300 lines, but still responsive with source files of a few hundred lines. Will try splitting source into smaller files, but that may be difficult to do in some cases.

Model Name: MacBook Pro (late 2013)

Model Identifier: MacBookPro11,1

Memory: 8 GB

OS: MacOS Sierra, 10.12.3

>Memory: 8 GB

I'd max that out in any case...

Same issue on 8.2.1 (8C1002) running on MBP/Mid-2015/2.2GHz i7/16GB ram. I open a .xib from Xamarin using the option to "Right click > Open with... > Xcode Interface Builder". It opens the .xib, starts indexing, then there is a massive drop in performance. I can barely select items to delete from the .xib, I tried dragging a View from the lower right. Constraining views on the page is virtually impossible since even the mouse cursor lags.

There is no reason this should bog down to an excruciating crawl. It's basically impossible to use. I tried downgrading back to 7.3.1, but Xamarin recently had an update that must have broken communication between the latest Xamarin build and 7.3.1, so now I'm forced to use 8.2.1. This is the worst.

EDIT:

On further investigation, it was the specific .xib I was working with. In the Simulated Metrics for the view, the "Top Bar" property was set to "Opaque Navigation Bar". Setting that option to "None" increased performance from -1000x to 1x. I have no idea why.

Clearing these directories did wonders for me. I'm using Xcode 8.3.1. Thanks @nico419 !

Note that Xcode 8.3.2 touts further performance improvements.

i have that problem w/xcode 8.3.3. it is particulalry acute when running from the battery. plug in the machine (it's old, old, old) and i sometimes don't notice the delay. go figure.

I absolutely agree with you

The problem still persists with xcode 9 GM, the editor doesn't feel fast like other do, maybe the problem is that xcode is building behind, the autobuild system should be running when user is not interacting with xcode otherwise it makes xcode feel very slow. I have the macbook pro 15 i7 2.7 GHz 16 Gb Ram 512 ssd radeon 455, it should be flying but it doesn't which is disapointing for an 2700 E piece of hardware. Also the graphics card has problem with the video drivers it does not draw everytime and some red rectangles appear where the windows should be until it gets focus, but there's a rumor it will disappear in mac os sierra high so i'll won't report as a bug yet.

xCode 8.2.1 is too slow to work.

specially for editing the *.xib file, please help me

3 GHz Intel Core i7

16 GB 1600 MHz DDR3

Intel Iris 1536 MB