...

almost any streaming sites..., like youtube..., and other things like file download..., and that of loading games in FB..., and ETC..., will definitely SUCK all bandwidth available in your connection.

your options:

half cooked remedy:
1. QOS
--1.a QOS via your modem/router [hardware] (may or maynot work..., depends)
--1.b QOS via your modem/router [via PFSense] (this is the best route I guess)

2. traffic shaping (pfsense also)

best option: (no lagg guaranteed ^_^)
buy another DSL line ^_^ (the 999php plan), create a dedicated PFSense router, dedicate your 5mbps for website browsing/youtube stuff etc..., and the other 1mbps line should be solely for internet gaming ^_^

I just cant find the specific link