CKEditor in IE11 doesn't handle large tables.

[Jakub Ś]

1. Open replacebycode sample in IE11.
2. Insert 300x300 table.

Result: page hangs after a while. The table is not inserted.

Problem can be reproduced only in IE11 from CKEditor 4.3

[Frederico Caldeira Knabben]

We're talking about 90,000 cells. If it would take 10 seconds average for the user to put something on each cell, it would take 250 hours to finish it. Sincerely, it doesn't look like a realistic use case.

The only think we could take in consideration is that the user may eventually set these values by mistake and then page hanging is not the best thing to have. We could eventually consider limiting the maximum size of the table.

[Piotrek Koszuliński]

Yes, this is totally unrealistic case. And there's not much we can do, because my tests show that this is native methods and rendering what take so much time.

However, setting maximum table size to something like 50 columns and 100 rows makes sense. I remember people asking for this in some other ticket.

[Piotrek Koszuliński]

BTW. I found that nativeSel.toString() method is extremely slow in this case. We call it when locking selection so it can be saved on editable blur. The thing is that... we wouldn't need to do that if we haven't got sel.getSelectedText() method which isn't needed by any of our plugins.

So some kind of workaround will be to remove this line ​https://github.com/ckeditor/ckeditor-dev/blob/3cf4f012aea6dbc52ff45b64e3e3f86be4a46a70/core/selection.js#L1647

Our plugins should still work and editor will become 2-3x more responsive when inserting and editing such huge tables.