Try adding to supercoin.conf this nodes:

addnode=85.25.201.132
addnode=37.187.144.69
addnode=104.131.255.227
addnode=46.165.208.140
addnode=128.107.239.233
addnode=185.9.62.204
addnode=188.26.107.82
addnode=217.191.139.185
addnode=109.242.51.11
addnode=151.84.198.23
addnode=92.228.122.55
addnode=192.99.36.88
addnode=79.183.66.206
addnode=79.126.81.71
addnode=60.240.49.38
addnode=89.212.222.230
addnode=74.105.241.83
addnode=93.215.88.100
addnode=116.14.224.127
addnode=31.15.162.69
addnode=84.250.6.190
addnode=98.231.201.7
addnode=109.230.13.30
addnode=71.122.196.114
addnode=83.10.87.77
addnode=95.150.136.32
addnode=91.122.168.35
addnode=103.6.85.64
addnode=116.8.76.109
addnode=82.8.7.44
addnode=85.25.201.132
addnode=148.251.7.226
addnode=37.187.144.69
addnode=46.165.208.140
addnode=71.122.196.114
addnode=116.14.224.127
addnode=174.2.194.186
addnode=104.131.255.227
addnode=93.136.67.114
addnode=178.32.55.67
addnode=84.52.163.134
addnode=80.11.70.97
addnode=108.199.229.161
addnode=98.231.201.7
addnode=94.23.240.208
addnode=77.6.123.121
addnode=185.9.62.204
addnode=184.154.4.65
addnode=95.182.106.43
addnode=79.126.81.71


My wallet works just fine and it`s SUPER FAST!