Start solution without project loading

Hi. I create extension (package) for Visual Studio with my custom project type. For project manipulating i use MPFProject. How can i load solution without projects loading. Project loaded only if i expand project node. It need because the solution has many projects (10000 or more). Can any help me, please?

P.S. I know about IVsSolutionLoadManager but this method do not work with MPFProject.