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by dogma1138 3736 days ago
Depending what you open, powershell.exe should open as fast as cmd.exe pretty much, the ISE can take a few seconds to load based on the addons you have and how many PS cmdlets you have registered on your system.

As people have mentioned the biggest factor here is probably your hard drive since you are loading maybe couple of 100's of small files when you load the ISE.