getData can be very slow depending on content

[agradl]

getData can be very slow depending on content

📝 Provide detailed reproduction steps (if any)

run the following code in the demo

var htmlData = "<p>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP</p><p>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP<br>Ho<strong>w do</strong> we <span style=\"font-family:'Courier New', Courier, monospace;\">get the<s> cont</s>ra</span>c<span style=\"font-size:18px;\"><strong>ts transferr</strong></span>ed over<span style=\"background-color:hsl(0,75%,60%);\"> from Tens</span>or to CQP</p>";
var ckEditorInstance = document.querySelector('.ck-content.ck-editor__editable').ckeditorInstance;
ckEditorInstance.setData(htmlData);
var sampleSize = 5;
var time = 0;
for (var i = 0; i < sampleSize; i++) {
	var start = new Date().getTime();
	ckEditorInstance.getData();
    var elapsed = (new Date().getTime() - start);
    console.log('sample ' + i + ' took ' + elapsed + 'ms');
    time += elapsed;
}
console.log('averaged ' + time/sampleSize + 'ms with a sample size of ' + sampleSize);

✔️ Expected result

getData returns in reasonable time and is possibly even cached until the model is changed so subsequent calls return in less time

❌ Actual result

Browser	CPU	time
Chrome 113	-	~560ms
Chrome 113	4x slower	2633ms
Safari 16.4	-	920ms

❓ Possible solution

It appears this problem was explored some time ago and this issue was predicted. #5812

📃 Other details

attribute	value
model	MacBook Pro 2019
processor	2.3 Ghz 8-core i9
memory	32 GB
macOS	Ventura 13.3.1

This issue is happening in our production environment with customer data.
The html used in the script above was generated to demonstrate the performance issue.

In our implementation we use @ckeditor/ckeditor5-react.
This issue is compounded by the fact that it uses Watchdog which has a _save
method that calls getData. This is throttled, but effectively pauses interaction
for the duration of the call every 5 seconds.

We also use the react CKEditor as a controlled component, storing the content and passing it
as the data prop, then updating it when the onChange callback is invoked. In addition to
us calling getData in the onchange callback, it is again called in _shouldUpdateEditor
when the react CKEditor component receives the new props.

I considered submitting this issue to the ckeditor/ckeditor5-react repo, but I think the issue
from four years ago highlights that the root cause is in getData and that any framework that
uses two way binding will suffer the same issue.

[Witoso]

Thanks for the report. @scofalik I know you were looking into watchdog performance.

[gfu7]

Recently, I have also been bothered by this similar issue. #14188
I am also paying attention to: how to use editor.getData() gracefully when as a controlled editor component.

[Witoso]

Regarding the watchdog performance please follow the #13098.

[CKEditorBot]

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[CKEditorBot]

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