The whole app is written in Typescript, except the webserver (Golang). We've already started to run into some performance issues on large projects. Eventually

The whole app is written in Typescript, except the webserver (Golang). We've already started to run into some performance issues on large projects. Eventually we will write the frontend in C++ (using emscripten to compile to JS). The UI will use React, but the canvas state will be in C++. Also, the monolithic backend will be split apart and rewritten in a different language to optimize speed. We have a lot of work to make it more performant, but it's going to be fun to build :)