Request for information: ISPs and P2P throttling

[plasmacutter]

ISP: Comcast
Location: US - Bay area California
Occurs pretty much any time I log in these days (evenings and weekends pacific).

As you can see.. comcast treats it fairly decently at only 1ms per hop.. It reaches L3 which decides to play "cranky customs agent" and suddenly the packet drops occur.

Traceroute:

$ traceroute 199.91.189.46
traceroute to 199.91.189.46 (199.91.189.46), 64 hops max, 52 byte packets
 1  192.168.1.1 (192.168.1.1)  3.844 ms  0.837 ms  0.765 ms
 2  50.131.12.1 (50.131.12.1)  19.579 ms  8.915 ms  9.444 ms
 3  68.86.249.29 (68.86.249.29)  9.797 ms  9.367 ms  9.296 ms
 4  68.87.194.94 (68.87.194.94)  13.880 ms
    68.87.194.98 (68.87.194.98)  14.886 ms
    te-1-15-0-13-ar01.sfsutro.ca.sfba.comcast.net (68.86.143.42)  14.266 ms
 5  he-1-6-0-0-cr01.sanjose.ca.ibone.comcast.net (68.86.90.157)  16.106 ms  17.901 ms  16.754 ms
 6  50.242.148.34 (50.242.148.34)  13.910 ms  17.215 ms  13.068 ms
 7  vlan90.csw4.sanjose1.level3.net (4.69.152.254)  87.008 ms * *
 8  * * *
 9  * * *
10  * * *
11  ae-3-3.ebr1.chicago2.level3.net (4.69.132.62)  92.767 ms  85.903 ms  86.031 ms
12  * * *
13  ae-10-10.car2.montreal2.level3.net (4.69.153.86)  343.514 ms  125.283 ms  126.450 ms
14  ormuco-comm.car2.montreal2.level3.net (4.59.178.74)  86.381 ms  88.004 ms  87.446 ms
15  * * *
16  192.34.76.2 (192.34.76.2)  87.496 ms  91.199 ms  87.770 ms
17  * * *
18  * * *