Script editor slows down page when it contains lots of characters

[marikaris]

How to Reproduce

Put a script editor on a page
Put 65000 characters in it
You may want to use a function like this:

generateString (length) {
        let text = ''
        const possible = 'GATC'
        for (var i = 0; i < length; i++) {
          text += possible.charAt(Math.floor(Math.random() * possible.length))
        }
        return text
      }

Expected behavior

Page loads with script input field

Observed behavior

Page loads very slowly and on firefox your browser may freeze