emena prwsopika me voi8ise katevike to ping -15/20
me syndesh 1mbps kai epeza me 55-70 (connex)
isws voi8isei kai allous.. 
1:Start > Run > type gpedit.msc (not available in home version).
2:Expand the Local Computer Policy branch. 
3:Expand the Administrative Templates branch.
4:Expand the Network branch.
5:Highlight the "QoS Packet Scheduler" in left window. 
6:In right window double click the "limit reservable bandwidth" setting. 
7:On setting tab check the ENABLED item. 
8:Where it says "Bandwidth limit %" change it to read 0 (ZERO).
9:Close gpedit.msc.
Effect is immediate on some systems, some need to re-boot. 
try it 8a deite diafora!!
ps:link: 
http://www.petri.co.il/increase_internet_connection_speed_in_windows_xp.htm