Sinсe Google Chrome was updated to 50.x version, it become impossible to work with DevTools. This issue reproduced mostly in \"Network\" tab. Every time when you click on \"requ
My situation was similar, after struggling a while with extreme slow developer tools response I found out the problem was caused by a Chrome extension I had installed for knockoutJs.
So for people experiencing these issues, as part of the initial troubleshooting, try disabling chrome extensions.