Wifi question.

really those numbers don't look bad, but with only a 5m download, that would be easy enough to max out just watching a HD video and that would cause everything to get laggy, otherwise, your ping time is good and no packet loss, did you run the test while
it was acting laggy? could you also go into detail of what it's doing that makes it feel laggy? like are you getting lag while play a online game, or it takes longer to open the friends list than before?

if you have a smartphone, you can also download a wifi analyzer that will at least show you other wifi signals in the area and what channel they are on, could help when trying to change wireless channels.

if you are playing online gaming using wifi - you are doing it wrong and gonna have a bad time!

Both of those numbers sound fine if you are paying for a 6MB down and 768KB up. That being said both of those speeds are the minimum I would have for online gaming.

Are you connected to your personal network WIFI or an open network..?? if it is an open network.. that is one main problem.. many other people are probably connected at the same time...Saying you know nothing of WIFI, just double check you are on your own
network...

If it your own wifi...how many devices are connected at the same time? This will hinder your connection as well..

What is your ISP rated at in general.. meaning... what service do you have and what are the speeds they are telling you you should get? go to Speedtest.net and run a test...

Chances are you just have a poor internet... might want to anti up and get something a little bit better...

Is it possible to connect with a cable?

Also, this site may help you with port forwarding with your specific router:
http://portforward.com/

Hope that helps