I've got three Go files open and looking at all the processes related to "Visual Studio Code.app", I see a residential memory footprint of 660MB. I'm using the latest version.
That also coincides with:
https://medium.com/@caspervonb/why-i-still-use-vim-67afd76b4...
And
https://github.com/jhallen/joes-sandbox/tree/master/editor-p...
What kind of files do you usually work with? Because I've currently got two 10000+ line python files open which are part of a project that is at least a million lines of code, and my VSCode instance is using less than 300 MB of RAM.