Why is my PS3 internet slow?

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Until about late February/early March the internet connection on my PS3 was completely fine, but now it slowed down for some reason. Nothing has changed, I have the same router and same everything. I use wireless because the router is in the living room and my PS3 is in my room. The only devices that are connected are my laptop and my PS3, but then again, this way it worked great before. Please help, I'm getting so much lag that playing Call of Duty Ghosts and Battlefield 4 is impossible.