Project rebuild times are high for large solutions

[ruhullahshah]

• Description
  If RestorePackages property is set to true in paket.targets (which is the current default behavior), then paket.exe apart from being launched by the plugin at the build start, also gets launched during the build. This increases the build time for large projects.

We couldn't find an API in Microsoft Visual Studio SDK or Microsoft.Build namespace that allows us to manipulate the data structures of the MSBuild Task under progress. Need suggestions on solutions such as providing a UI option to disable restore or other thoughts

Some additional Info:

1. As a workaround, we currently set RestorePackages to false which is equivalent to saying /p:RestorePackages=false
2. A reference ticket at MSDN: https://social.msdn.microsoft.com/Forums/en-US/e00643ac-ca87-4fd6-9c47-0e78f4f2e430/is-there-a-programmatic-way-to-manipulate-the-properties-of-current-build-from-within-a-vs?forum=msbuild\