title: How do I disable restoring NuGet packages while starting the solution
body: <p>every time I start my solution (65 projects, UWP, WPF, NetStandard) I can see in my output window (Package Manager) that NuGet is restoring packages. This task needs about 26 seconds. I wonder if this is necessary because why should I want to restore the packages every time I start the solution? It would be great if I could disable it.</p>
  
  <p>I am using Visual Studio 15.2 (26430.16)</p>
  
  <p>Thank you for your help!</p>