Why lose internet speed when laptop is closed

My connection to the internet goes from 10mg to less than 1mg when I attach an HP screen to my MacBook Pro...when I shut the laptop?

According to this article:
http://support.apple.com/kb/HT1365
Certain external monitors and LCD displays: Certain displays may emit harmonic interference, especially in the 2.4GHz band between channels 11 and 14. This interference may be at its worst if you have a portable computer with the lid closed and an external monitor connected to it. Try changing your access point to use 5 Ghz or a lower 2.4 GHz channel.
Regards,
Captfred

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