I don't get really get this "quickly" thing. I just checked, on my 2014 MBP my VSCode takes < 3 seconds to open a project from shutdown, including opening 14 files. Checking Sublime Text 3 it's faster (1.5 seconds?) but 3 seconds it's not enough for me to care.

I tested "Visual Studio". It takes ~10-12 seconds. For some reason VSC code fits within my threshold of "fast enough I don't feel like I had to wait at all" where as visual studio feels like I'm waiting. I guess your threshold is lower than mine though.