blocks|key|256292|text|下载it+11.4模拟器并试用它。缺点是您不能测试iOS12。但至少您可以使用Xcode+10并发布应用程序。注意:不必费心获取Xcode+9.4.1。或者其他版本。它解决不了问题。诀窍是在您第一次运行Xcode+10之后，它将新的核心模拟器框架安装到根文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|256293|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

download iOS11.4 simulator and try it. The downside is you cannot test iOS12. But at least you can work on Xcode 10 and get the App released. 
Note: don’t bother to get Xcode 9.4.1. Or other versions. It won’t fix the problem. 
The trick is after you run Xcode 10 the first time, it installed the new coresimulator framework to your root folder.

blocks|key|885054|text|对我起作用的是切换调试>图形质量中的值，以覆盖模拟器菜单中的。令人惊讶的是，在从“设备默认”设置为“低”之后，滞后就消失了，现在任何价值都像一种魅力。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|885055|entityMap^0|9|2|C|I|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

What worked for me was switching the values in Debug > Graphics Quality Override of the Simulator menu.
Surprisingly, after setting to 'Low' from 'Device Default', lag was gone, and now any value works like a charm.

blocks|key|885008|text|我也有同样的问题，这个问题解决了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|885009|defaults+write+com.apple.CoreSimulator.IndigoFramebufferServices+FramebufferRendererHint+X++|code-block|syntax|javascript|885010|其中X为：|885011|0=自动|885012|1=金属|885013|2=+OpenCL|885014|3=+OpenGL|885015|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I had same problem and this fixed it:

<pre><code>defaults write com.apple.CoreSimulator.IndigoFramebufferServices FramebufferRendererHint X 
</code></pre>

Where X is:

0 = auto

1 = Metal 

2 = OpenCL

3 = OpenGL

blocks|key|255474|text|在升级到XCode10之后，我遇到了与这里描述的完全相同的问题。每次我打开模拟器，不管是IphoneX还是Iphone，我的mac都爬到了几乎停止的地方，模拟器用几个FPS执行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|255475|--下列操作无效：|offset|length|style|BOLD|255476|FramebufferRendererHint设置|unordered-list-item|255477|复位模拟器|255478|重新安装xcode|255479|创建新用户|255480|删除Xcode+10并安装XCode9|255481|删除CoreSimulator.framework并安装新的模拟器|255482|终于成功了：|255483|使用时间机器恢复CoreSimulator.framework和Xcode.app+(我的上一次备份是从2017年9月开始的，所以现在im运行Xcode9.1，但至少它再次工作了(！)|255484|不确定是否相关，但我正在开发一款旧的IMac，2011年年中。|255485|entityMap^0|0|0|9|0|0|0|0|0|0|0|0|6|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|J|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|J|7|18|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|19|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|1A|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|1B|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@]|A|$]]|$1|W|3|X|5|J|7|1F|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1G|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|11|$]]

I had the exact same problem as described here after upgrading to XCode10. Every time I opened the simulator, no matter if it was a IphoneX or Iphone SE, my mac crawled to almost a stop and the simulator performed with a couple of FPS.

The following did not work:

<ul>
<li>FramebufferRendererHint settings</li>
<li>Reset simulators</li>
<li>Reinstall xcode</li>
<li>Created new users</li>
<li>Delete Xcode 10 and install XCode9</li>
<li>Delete CoreSimulator.framework and install new simulators</li>
</ul>

What finally worked:

<ul>
<li>Revert CoreSimulator.framework and Xcode.app using Time Machine(my last backup was from september 2017, so now im running Xcode9.1, but at least its working again(!))</li>
</ul>

Not sure if its relevant, but im working on a old IMac mid 2011.

blocks|key|1730210|text|当我从风景转到肖像时，我遇到了麻烦。景色就不会动了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1730211|我发现的唯一的工作就是命令%2B箭。这将模拟卷向上按压，但也会在旋转后刷新显示。|1730212|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had troubles when switching from landscape to portrait. views would just not move.

The only work around I found was Command + Arrow up. This simulates a volume up press, but also refreshes the display after the rotation

blocks|key|885103|text|是的，这与你所说的慢动作无关。Xcode模拟器在全球范围内性能极低。这是苹果的错误。我已经通过反馈助理报告了这件事。我用代码创建了演示程序，证明模拟器比任何旧的真实设备慢200倍，我发现在WKWebView中执行日期对象的JavaScript代码对模拟器来说是痛苦的。看到https://jsfiddle.net/kjms16cw/，我希望苹果很快就能修好它！|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|885104|​|885105|var+log+=+document.getElementById("log");
document.getElementById("button").onclick+=+function()+{+run();+};

function+run()+{
	var+d1+=+new+Date();
	for+(var+i+=+0;+i+<+1000;+i%2B%2B)+{
		var+x+=+new+Date();
		x.setMilliseconds(0);
		x.setSeconds(0);
		x.setMinutes(0);
	}
	var+d2+=+new+Date();
	log.innerHTML+=+((d2.getTime()+-+d1.getTime())+/+1000)+%2B+"+seconds";
}|code-block|syntax|javascript|885106|<h3>Xcode+Simulator+Extremely+Low+Performance</h3>
This+test+runs+fast+(several+tens+milliseconds+e.g.+30+ms)
in+any+browser+any+device+any+platform+including+very+old+iOS+device
e.g.+iPhone+5C+and+several+years+old+iPad+2,+BUT+IN+SIMULATOR+IT+TAKES+6000+ms+
(yes,+6+seconds!).+Terrible!
<button+id="button">run()</button>
<div+id="log"></div>|885107|885108|entityMap|0|LINK|mutability|MUTABLE|url|https://feedbackassistant.apple.com/|1|https://jsfiddle.net/kjms16cw/^0|1M|W|1B|4|0|3S|U|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]|$9|15|A|16|1|17]]|E|$]]|$1|F|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]|X|$5|S|T|U|E|$V|Y]]]]

Yes, it is NOT about slow motion as you said. Xcode simulator has extremely low performance in global. It is Apple's bug. I have reported it via <a href="https://feedbackassistant.apple.com/" rel="nofollow noreferrer">Feedback Assistant</a>. I have created demo with code demonstrating that simulator is 200 times slower than any old real device. I have found that JavaScript code with Date object executed in WKWebView is pain for simulator. See jsfiddle <a href="https://jsfiddle.net/kjms16cw/" rel="nofollow noreferrer">https://jsfiddle.net/kjms16cw/</a> I hope Apple will fix it soon!

<div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var log = document.getElementById("log");
document.getElementById("button").onclick = function() { run(); };

function run() {
	var d1 = new Date();
	for (var i = 0; i &lt; 1000; i++) {
		var x = new Date();
		x.setMilliseconds(0);
		x.setSeconds(0);
		x.setMinutes(0);
	}
	var d2 = new Date();
	log.innerHTML = ((d2.getTime() - d1.getTime()) / 1000) + " seconds";
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;h3&gt;Xcode Simulator Extremely Low Performance&lt;/h3&gt;
&lt;p&gt;This test runs fast (several tens milliseconds e.g. 30 ms)
in any browser any device any platform including very old iOS device
e.g. iPhone 5C and several years old iPad 2, BUT IN SIMULATOR IT TAKES 6000 ms 
(yes, 6 seconds!). Terrible!&lt;/p&gt;
&lt;button id="button"&gt;run()&lt;/button&gt;
&lt;div id="log"&gt;&lt;/div&gt;</code></pre>
</div>
</div>

blocks|key|256312|text|确保“慢动画”(调试>慢动画)不会意外启用。我已经做了很多次了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|256313|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Make sure "Slow Animations" (Debug > Slow Animations) is not accidentally enabled. I've done it so many times :(

Everything worked perfect on Xcode 9. But after updating to Xcode 10, Simulator started to get huge lags. Super simple animation is working on 2 fps and whole Mac OS is super slow while animation on Simulator is working. Anybody know what happens and how to fix that? Any app or any standard iOS app is the same terrible slow.

Explanation — it is NOT about slow motion that I can switch with Command⌘ + T. I am talking about huge lags. When UIView is flying it appears in another position jerkily. Not smooth slow animation. 2 fps is not slow motion. It is the same fast motion but in 2 FPS!

Simulator on Xcode 10 became terribly slow

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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所有的东西都在Xcode 9上运行得很好，但是在升级到Xcode 10之后，模拟器开始出现巨大的滞后。超级简单的动画工作在2 fps和整个Mac是超级慢，而动画在模拟器上是工作的。有人知道发生了什么以及如何解决这个问题吗？任何一个应用程序或任何标准的iOS应用程序都是同样可怕的慢。解释-这不是关于慢动作，我可以切换命令⌘+ T。我说的是巨大的滞后。当UIView在飞行时，它突然出现在另一个位置。不

问Xcode 10上的模拟器变得非常慢
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