After installing a major Windows 10 update yesterday, my Internet connection got extremely slow when using Microsoft Edge, Internet Explorer or Firefox. But Google Chrome runs at normal speed.
The problem is only when I load a page - loading www.microsoft.com takes about 10-15 seconds in a private browser window. Except for Chrome where it takes less than 2 seconds. Drop-down menues and other elements works at full speed - but AJAX autocompleting is also slow.
This is general for all pages - they are about 5-10 times faster in Chrome now, and they used to have the same speed in the other browsers before the Windows update.
I've noticed that every time the browser is loading something, taskhostw.exe has a high CPU and disk usage. (Except Chrome where taskhostw.exe doesn't seem to be active).
I tried to disable Windows Defender real time protection - that did not make any difference. I have no other firewalls, proxies or virus scanners.
The latest updates from Windows Update are installed today. Current software versions are Microsoft Edge 41.16299.15.0, Internet Explorer 11.98.16299.0, Firefox 57.0.1 and Chrome 62.0.3202.94. taskhostw.exe has version 10.0.16299.15.