Installed Windows 10, access to internet (Firefox) and news groups often very slow. Webpages address needed to be refreshed several times. Access to f9 and Mozilla newsgroups via Thunderbird often timed put. Tried several things but what worked in the end was to change 'Obtain server DNS automatically' to 'use the following DNS server addresses. 220.127.116.11,and 50'. Now load at the speed I would expect. Can anybody explain?