Network performance degradation with multiple networks

[MikeKorinthos]

I recently installed Siemens OpenStage 60T phone in my computer with the IP suggested by Siemens. The result is that now I have multiple networks (one for my domain network and an unidentified for the phone) and I noticed a degradation in network performance (not in internet connectivity). Can anyone help me with that?
Below is the output of the route print command...

===========================================================================
Interface List
11 ...06 14 27 88 59 e5 ...... OpenStage 60/80 T USB Remote NDIS Network Device #2
9 ...00 1c 23 df 30 19 ...... Intel(R) 82566DM-2 Gigabit Network Connection
1 ........................... Software Loopback Interface 1
12 ...00 00 00 00 00 00 00 e0 isatap.{9DB72268-8931-41B7-BED7-315918219EF9}
13 ...00 00 00 00 00 00 00 e0 isatap.{A5214304-EF20-4927-9B4A-F3460AAF03EA}
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.1 266
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
169.254.0.0 255.255.0.0 On-link 192.168.200.2 30
169.254.255.255 255.255.255.255 On-link 192.168.200.2 286
192.168.1.0 255.255.255.0 On-link 192.168.1.1 266
192.168.1.1 255.255.255.255 On-link 192.168.1.1 266
192.168.1.255 255.255.255.255 On-link 192.168.1.1 266
192.168.200.0 255.255.255.0 On-link 192.168.200.2 286
192.168.200.2 255.255.255.255 On-link 192.168.200.2 286
192.168.200.255 255.255.255.255 On-link 192.168.200.2 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.1 266
224.0.0.0 240.0.0.0 On-link 192.168.200.2 286
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.1 266
255.255.255.255 255.255.255.255 On-link 192.168.200.2 286
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 192.168.1.254 Default
0.0.0.0 0.0.0.0 192.168.1.254 Default
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
9 266 fe80::/64 On-link
11 286 fe80::/64 On-link
12 266 fe80::5efe:192.168.1.1/128 On-link
13 296 fe80::5efe:192.168.200.2/128 On-link
9 266 fe80::404:47d3:44c4:9bb4/128 On-link
11 286 fe80::28c1:66ea:80d6:faac/128 On-link
1 306 ff00::/8 On-link
9 266 ff00::/8 On-link
11 286 ff00::/8 On-link
===========================================================================
Persistent Routes:
None