Trace route to 40.16.106.32 from 64.25.175.200

1 0 ms 0 ms 0 [64.25.175.200]
2 0 ms 0 ms 0 [64.25.175.253]
3 0 ms 0 ms 0 border-from-40-tesser.boulder.co.coop.net [207.174.144.169]
4 0 ms 0 ms 0 [64.25.128.126]
5 0 ms 0 ms 0 p3-0.dnvtco1-cr3.othernet.net [4.25.26.53]
6 0 ms 0 ms 0 p2-1.dnvtco1-br1.othernet.net [4.24.11.25]
7 0 ms 0 ms 0 p15-0.dnvtco1-br2.othernet.net [4.24.11.38]
8 30 ms 30 ms 30 p15-0.snjpca1-br2.othernet.net [4.0.6.225]
9 30 ms 30 ms 30 p1-0.snjpca1-cr4.othernet.net [4.24.9.150]
10 1252 ms 1212 ms 1202 h0.webhostinc2.othernet.net [4.24.236.38]
11 1252 ms 1212 ms 1192 [40.16.96.11]
12 1262 ms 1212 ms 1192 [40.16.96.162]
13 1102 ms 1091 ms 1092 [40.16.106.32]

Trace route to 64.25.175.200 from 40.16.106.32

1 1 ms 1 ms 1 ms [40.16.106.3]
2 1 ms 1 ms 1 ms [40.16.96.161]
3 2 ms 1 ms 1 ms [40.16.96.2]
4 1 ms 1 ms 1 ms [40.16.96.65]
5 2 ms 2 ms 1 ms border8.p4-2.webh02-1.sfj.fastnet.net [216.52.19.77]
6 2 ms 1 ms 1 ms core1.ge0-1-net2.sfj.fastnet.net [216.52.0.65]
7 993 ms 961 ms 999 ms sjo-edge-03.inet.slownet.net [208.46.223.33]
8 1009 ms 1008 ms 971 ms sjo-core-01.inet.slownet.net [205.171.22.29]
9 985 ms 947 ms 983 ms svl-core-03.inet.slownet.net [205.171.5.97]
10 1028 ms 1010 ms 953 ms [205.171.205.30]
11 989 ms 988 ms 985 ms p4-3.paix-bi1.othernet.net [4.2.49.13]
12 1002 ms 1001 ms 973 ms p6-0.snjpca1-br1.othernet.net [4.24.7.61]
13 1031 ms 989 ms 978 ms p9-0.snjpca1-br2.othernet.net [4.24.9.130]
14 1031 ms 1017 ms 1017 ms p3-0.dnvtco1-br2.othernet.net [4.0.6.226]
15 1027 ms 1025 ms 1023 ms p15-0.dnvtco1-br1.othernet.net [4.24.11.37]
16 1045 ms 1037 ms 1050 ms p1-0.dnvtco1-cr3.othernet.net [4.24.11.26]
17 1030 ms 1020 ms 1045 ms p0-0.cointcorp.othernet.net [4.25.26.54]
18 1038 ms 1031 ms 1045 ms gw234.boulder.co.coop.net [64.25.128.99]
19 1050 ms 1094 ms 1034 ms [64.25.175.253]
20 1050 ms 1094 ms 1034 ms [64.25.175.200]

where is the real traffic congestion?

Have to take a stab at this one. It appears from the traceroutes its othernet.net thats your bottleneck. If othernet.net appeared on both I would have said the link between the two companies but thats not happening. You could report an issue to them. arin.net shows Genuity owns the subnet block and the csoulia@genuity.com is the technical email contact.