restart pc to clean ram, uninstal unnesesarry programs,games.. defrag hard drive
recepy to a messed up pc, i never did a defrag in any of my pcs and they are fine, that's almost a myth. It only works on pc's full of shit.
gee, yeah, helps a lot with a internet connectivity issue!
And yeah, it doesn't help the connection.
MY ANSWER:
-turn off your anti virus when you play.
-doesn't work? turn off the firewall. Maybe it has a gamemode.
give it a try, if it stays the same, turn them on again. If it improves, turn of the AV and firewall when you play(and turn them on in the derby

).