i have radmin VPN room in my PC with 5 of my friend i have great ping with 4 of my friend ( 40-60ms) but bad ping on 1 of my friend (400ms++) , i think its my ISP problem and then i start using another ISP but have same result then i try ping my friend that i have bad ping on it with my laptop with same ISP like my PC then my laptop got good ping on it any solution for this ?
Check if there is no programs that overload your network, like FTP, torrents or Windows updates.
And the more Radmin VPN networks you are connected to, the less performance you have.