What Do I Need To Run A External Moniter with a Macbook Pro?

I have a Mac Book Pro 13in Mid 2009 Model. I replaced the RAM to 8GB, I have an HDMI Converter cable to plug my mac book into my 21in moniter, but it seems like it is still lagging behind, with internet connection but the screen just cant keep up or something. Is that a graphics card issue or is there something else that I need to improve the video on my monitor.

JimmyCheckers,
there’s not enough information to say for sure. If you watch a video which lags on your external monitor on your built-in display instead, does the lagging cease, or is the lagging also observable on the built-in display? If you completely download a video onto your internal disk before watching it, does it still lag on the external monitor? Does it lag on the built-in display?

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