Performance issues with Xcode 10.2. IDE and simulators.

Please note I did open a bug report on this. Are others suffering through terrible performance on Xcode 10.2? I'm on an iMac Pro 10 core. And it's really slow. Not as slow like when they had issues with Xcode 9 ... but slow.


It's difficult to edit. Even worse if you're compiling or near the end of a compile. Scrolling causes the beach ball to show up. I'd revert back to 10.1 ... but my devices are upgraded to an iOS version that requires Xcode 10.2. I don't feel like downgrading iOS versions just yet.


Compiles are slow. When compiling on my Macbook Pro (also upgraded), project takes 10-15 minutes to compile. iMac Pro takes several minutes as well. Admittedly it is a large project so it did take some time, but now it is much worse.


The simulators are sluggish. Any Apple dialog is show to display and difficult to dismiss. I hadn't experienced that since the terrible/unusable versoin of Xcode 9 with sim issues as well as when I was working on a Macbook Pro.

Replies

It is ridiculously slow. I can run Logic Pro with tons of audio effects but to edit text in Xcode is painfully slow. Compile times are long as well.

My computer is a 2015 i7 with 16G ram and 1T SSD and it is slow. I can understand compile times being slower, but simple text editing should not be slow.

You got to love Apple responsiveness ...

yeah.. xCode not just slow but also so buggy.. very hard to work with it.

Simulators not laoding assets from first time. Need to restart it a couple of times. Can't test normally.

Close XCode.

Navigate to your project file, right click and select "Show Package Contents", then delete the *.xcworkspace file.

Re-open Xcode.

Immediate fix for me.

@HaroldMaurice's suggestion worked for fixing extremely slow editing, code-completion in Xcode 12.4 🙏🏻