Yes, older routers are bottlenecks on many of todays faster internet connections. And moving towards a current generation router will help improve your speeds.
http://www.smallnetbuilder.com/compo...rt/Itemid,189/
Look at the throughput speeds of some of the newer models in the above chart.
On your current router...I'd look for performance reviews on it, see what it's throughput is, maybe ensure that it has the latest firmware..and go from there.
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