> ... A Modern and Efficient Alternative to JupyterLab ...
This is not meant as criticism, just perspective. It's a classic development sequence:
* A team creates a powerful, small-footprint, REPL environment.
* Over time people ask for more features and languages.
* The developers agree to all such requests.
* The environment inevitably becomes more difficult to install and maintain.
* A new development team offers a smaller, more efficient REPL environment.
* Over time ... wash, rinse, repeat.
This BTW is what happened to Sage, which grew over time and was eventually replaced by IPython, then Jupyter, then JupyterLab. Sage is now an installable JupyterLab kernel, as is Go, among many other languages, in an environment that's increasingly difficult to install and maintain.
Hey -- just saying. Zasper might be clearly better and replace everything, in a process that mimics biological evolution. Can't leave without an XKCD reference: https://xkcd.com/927/
Again, not meant as criticism -- not at all.