Both of my PCs did an automatic download and update to Windows 10 anniversary over a month ago, and have done a couple of more updates since then. Internet speeds have slowed from 30 to 60 Mbps (typical) to 5 to 12 Mbps since the updates. I did driver updates for my 802.11 b/g/n Dell adapters - no change. Same problem on any browser I try. Speeds on my iPhone are still around 30 to 60 Mbps so I know my ISP modem/router is fine. Then my laptop finally did its first and lengthy Windows 10 anniversary update this morning. I tested the speeds right away and they were in the usual 30 to 60 Mbps range. The laptop has a 802.11 ac adapter card. So the problem seems to be between Windows 10 anniversary version 1607 and my "older" 802.11 b/g/n network adapter cards. Other than replacing my PC network adapter cards... any suggestions?
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