i won't help but just to say i'm experimenting same problem since two-three patches. I always got some spacelags on redbana but since around once month it became worst. I have also an old computer, old graph card with windows 8, even less ram than you, but until now, it was not a problem. Now it starts to be very unbearable to play and it seems not coming from my computer or my net :-(
"Happy" to read that one other player is encountering same problems, feeling less alone.