Why my safari became very slow with dual screen

I've just recently set up my mac mini with two monitor, when opening websites in safari, it takes up to 30 seconds to load, sometime even longer, and everything goes back to normal when second screen is power off or unpluged. please help
v/r

Wow, this is a new one on me!???
Is this the new 2012 Mini?
Which port is the second Monitor connect to & by what?
Open Console in Utilities & see if there are any clues or repeating messages when this happens.

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    Carolyn
    Message was edited by: Carolyn Samit

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