1. To optimally size your paging file,  start all the applications you run at the same time, load typical data sets, and then note the commit charge peak.
2. Look at this value after a period of time where you know maximum load was attained.
3. Set the paging file minimum to be that value minus the amount of RAM in your system
   • If the value is negative then pick a minimum size to permit the kind of crash dump you are configuring for.
4. If you want to have some breathing room for potentially large commit demands, set the maximum to double that number.

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Reference blog post:  https://www.citrix.com/blogs/2011/12/23/the-pagefile-done-right/