I think it's very subjective what is considered performant. I for one don't think about VSCode as a performant app, for me it is a resource hog, not at all that responsive app, there's always a slight delay / lag in input reaction, simply not a fast application.
SublimeText, Notepad++, CudaText and LiteXL have acceptable performance, memory footprint and responsiveness for my taste (but this is certainly not a benchmark, just another subjective viewpoint :) )
