Text files with a lot of lines take really long to display

[jpxd]

Description
I uploaded a 1MB text-file which contains about 30000 short lines. When opening in the browser, the page freezes and it takes about 24 seconds until the file is displayed. I used the newest Google Chrome on a decent laptop.

Expected behaviour
The file should be opened and displayed in less time and the page should not freeze. Alternatively, there could just be a message, that large text files cannot be previewed in the browser and have to be downloaded.

What is happening instead?
The file takes about 24 seconds to display. Meanwhile the whole page freezes and is unresponsive. Chrome even killed the page once (err code: RESULT_CODE_HUNG)

Additional context
The long waiting delay does seem to correlate with the amount of lines and not with the file size. For comparison, a 1MB file with just 1000 lines just takes about 3 seconds. I did a chrome profiling session:

Here is the chrome profile: Profile-20200618T114046.json.zip

How to reproduce?
Upload the test.txt file (see below). Open the file. It takes a long time.

Files
Test.txt: test.txt.zip

[o1egl]

@jpxd thank you for reporting. The problem is in the ace editor. It is constantly resizing. As a workaround I set maxLines: 80. This is not an ideal solution. I would prefer to set the dynamic size of the editor depending on the page size.