I bought new Ethernet cables for my home network and I can say that makes a big difference.
I Switched from the Cat5 cables from my Internet provider to this cables : http://www.newegg.com/Product/Produc...82E16812119438

I read some reviews from the best selling ones and one guy said no problems with the Rosewill forget the popular ones at amazon..
What I can say is now I have a ping of 23-28 instead of 35-38 on the Rocket league servers.