It's not an all C# project; C# only comprises the backend.
All in, the mono-repo is somewhere over 250k SLOC with mixed languages (Vue SFC, TS, Astro, JSX, shell). So when VSC is loaded, it's not only handling C#, but also everything else.
Point is that VSC is more than capable of handling production scale, multi-language workspaces even on 2021 hardware with only 16GB of RAM.
All in, the mono-repo is somewhere over 250k SLOC with mixed languages (Vue SFC, TS, Astro, JSX, shell). So when VSC is loaded, it's not only handling C#, but also everything else.
Point is that VSC is more than capable of handling production scale, multi-language workspaces even on 2021 hardware with only 16GB of RAM.