优化Visual Studio解决方案构建 - 放置DLL文件的位置？

I found out that build time of C# solution with many projects gets much faster if you don't have "copy local" enabled everywhere. I did some tests and it seems that (for our solution at least) we could increase build time by factor 2-3 just by removing "Copy local". This probably means we have to store libraries in some common directory.I found out that build time of C# solution with