pete, jc, edge gives me the same results as ie11 using windows 10 after the anniversary update. prior to that everything worked fine. my download speeds are cut exactly in half during large file downloads and this site will never get out of the 30's when testing with ie11 & edge, which should get 100+ results.
here is what I know so far...
windows 7, 8.1 and windows 10 prior anniversary update, all browsers get same accurate speed test results.
seems the anniversary update only affects ie11 and edge. other browsers get accurate results
ive searched for days trying various fixes from turning off auto tuning, turning Qos to 0% using gpedit, adjusting tcp settings using tcp optimizer, turning off ipv6, etc... prob tried at least 20 fixes that others claim works but none of them work for me. when downloading large files my transfer rate is 12.8MB/s using firefox. when using ie or edge its slashed down to 5 or less. I am directly connected via Ethernet cable.
if anyone reading this knows of a fix to keep windows 10 from slashing internet speeds in ie11 & edge, please post, it would be much appreciated