After installing the program my start up time increased by about 30 seconds. Any ideas why?
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Try doing a few restarts - sometimes the first restart after any software install can be a little slower.
Other things to try:
1) Defrag your hard drive.
2) Use Microsoft / Sysinternals Autoruns to see if anything else you have installed recently is starting with the machine.
(If you just mean PowerShell is slow to start - it is a .Net program, the first time you run it, it needs to be recompiled... subsequent runs are usually a lot faster/instant.)