I know it seems weird going to an older version, but my ping has never been nearly to high with 18 and with 19 it is worse than terrible. On 19 my ping gets up to 1200 and never gets below 500 and I'm lagging so bad I can hardly play. I never run programs while I play dp; sometimes I run Spider-Man Solitaire though, but that isn't an active program and should make any difference. I'm pretty sure that build 19 has something to do with this; and I have wireless internet too.