Microsoft Premier Field Engineer Matthew Reynolds presented a presentation this month at our November 2013 user group meeting on writing PowerShell Scripts that Scale. This is really an awesome presentation. He starts out by talking (audio only) for about 5 and a half minutes out of the hour long presentation to kind of give you an introduction.
I really like the way Matthew not only tells you that designing your script a certain way in specific scenarios will perform better or worse but also graphically shows you the difference of the performance of different examples in performance monitor.
As referenced in the video, Matthew is a contributing author of a chapter in the PowerShell Deep Dives book:
Be sure to join in next month (on December 10th at 8:30pm Central Time) when Trevor Sullivan who is also a contributing author of a chapter in the PowerShell Deep Dives book will be presenting for us. Sign up for next months online (virtual) meeting on Eventbrite.
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