After the installation of Visual Studio 2017 latest edition, I have been watching memory consumption. Node.exe seems to be consistently around 500-700mb of RAM!. I did find this post which helps explain what is going on.
"wwwroot/lib" //ignore everything in the lib folder (bootstrap, jquery, etc) // add any other folders with library code here
"jquery" //list libraries you are using here
“Disabling the TypeScript extension is a work around for the moment, at least for me. Click Tools, Extensions and Updates, search for "TypeScript" and disable it. Restart Visual Studio.”
Give it a try and let me know how it goes….