Onedrive for Business open is very slow on Linux (Chrome/Firefox) but with very fast with a "Windows" user-agent

Hello,

Onedrive for Business open is very slow on Linux (Chrome/Firefox) but with very fast with a "Windows" user-agent.

On Ubuntu/Linux 16.04 + Chrome/Firefox (last version), when I open:

https://<my_company>-my.sharepoint.com/personal/<my_user>/_layouts/15/onedrive.aspx

During 2 min, UI is unresponsive, CPU 100%.

Network panel shows a page load of ~100Mb

I have isolated the page that have a different rendering on Linux than on Windows:

https://euc-word-view.officeapps.live.com/wv/StaticLoad.aspx?wx=w&wv=v&usescript=1&ui=fr%2DFR&WOPISrc=
https://euc-word-edit.officeapps.live.com/we/StaticLoad.aspx?wx=w&wv=e&usescript=1&ui=fr%2DFR&WOPISrc=
https://euc-excel.officeapps.live.com/x/StaticLoad.aspx?wx=x&wv=v&usescript=1&ui=fr%2DFR&WOPISrc=
https://euc-powerpoint.officeapps.live.com/p/StaticLoad.aspx?wx=p&wv=v&usescript=1&ui=fr%2DFR&WOPISrc=

[... 2 others]

If I force a "Windows" user-agent for my browser, Onedrive works as expected.

Is it possible to disable user-agent checking ?

Thank you

DL