Mine have gone way down too. Dunno whats up with comcast but I hope I figure something out. CableNut is sweet used it for years but made some personal variants in the settings.
:::.. Download Stats ..:::
Download Connection is:: 11528 Kbps about 11.5 Mbps (tested with 12160 kB)
Download Speed is:: 1407 kB/s
Tested From:: https://testmy.net/ (Main)
Test Time:: 2007/11/03 - 10:14am
Bottom Line:: 201X faster than 56K 1MB Download in 0.73 sec
Tested from a 12160 kB file and took 8.641 seconds to complete
Download Diagnosis:: Awesome! 20% + : 95.13 % faster than the average for host (comcast.net)
D-Validation Link:: https://testmy.net/stats/id-FL84V3HCQ
User Agent:: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9 [!]