Zed is so great, I do wish they would focus just a little bit more on bringing the UI just a bit more up to parity with VS Code, I would switch full time.
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Meanwhile on Linux and Windows, they still implement subpixel rendering so fonts look great on 1440p.
1) How much font hinting to apply. More hinting changes the shape to make glyphs line up better with pixels so that less antialiasing is required. macOS prefers very light hinting to preserve shapes at the cost of blurriness. This is what you are talking about.
2) Subpixel rendering. This effectively triples the horizontal resolution when rendering fonts, and does not affect the shape at all. Fonts look dramatically better on normal dpi displays when using it. macOS removed support for this many years ago. This is what I'm talking about.