2560 x 1664 is the resolution of the latest M5 Air. The default UI is 1470 × 956. "More space" is 1710 × 1112.
When you set it to "more space" it becomes noticeably slower, but not blurry.
When you set it to "more space" it becomes noticeably slower, but not blurry.
Apple basically settles into 220 dpi physical displays (250 moc MacBook Pro), rendering UI at a 2x scale as a default, except for MacBook Airs.