> I wonder why you claim it has performance issues
It's true, I haven't tried it. Perhaps this solo dev has succeeded where large teams with more resources have failed.
> I'm still awaiting your link to a superior native alternative
Sorry; I thought you wanted one that I'd written. I've used SimpleNote for years. It's got dozens of clients, many of them native; I use NValt, Resoph Notes, and the official iOS client. It supports markdown. It doesn't support plugins, but you didn't want that until just now.
> If you can detect the input lag in Visual Studio Code
I use VSCode extensively for a large Angular project on a Macbook Pro with a 4K screen. I get trivially reproducible hitching, often when autocomplete kicks in. It doesn't require superhuman senses to see. The console is also easy see lag on; just use it to edit a commit message with vim during a rebase. Character input speed is easier to notice if you've been using Sublime or Vim immediately beforehand. It's not a deal-breaker; VSC is unparalleled for Angular development. I wish it was snappier, though.