Can having too programs on the dock slow my computer down

Can having many program icons on the dock slow down the computer or use up the memory.

How would i know if there running
Whether there is a blue light below them; any running application will have a blue light below them in the Dock. Processes which don't have an user interface won't appear in the Dock.
can i set them to idle
Quit an application if you think it's consuming too much resources and don't need it open. Launch the Activity Monitor in the /Applications/Utilities/ folder to find out how much processing power and RAM a process uses; don't quit the loginwindow process or anything owned by root unless otherwise noted.
(39552)

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