Save & View Warning message when content page size > 730ko

Hi,

I install a new xwiki in my school for create a knowledge base and i have some trouble with a little thing.
When update a page with some content to editor like text (see attachment loremipsum.docx), if datasize of page > 730ko, saving page doesn'work and show a warning message (see warning_xwiki.jpeg).
If we import office document in a existing page or create a new one with copy/paste data, it's the same issue if doc size > 730ko.
Curiously, when we create a new page from office document it's working and the page is saving correctly(but in the wrong space). But if we need to apply some changes to this page Save & View doesn't work anymore.
I use loremipsum for my test but it's the same thing with a basic office document with images with import or copy/paste. If size < 730ko it works! - >730ko doesn't work.
Maybe i do something wrong in my configuration or maybe there is a limitation? Have you ever seen this issue?
Thanks a lot for your help

best regards
Romain