M2 Max, 64GB
LG UltraFine: USB-C > USB-C
LG UltraHD: HDMI > USB-C
vwx2024 & 2025, latest build
Updated to macOS 14.7:
no improvement
Updated to macOS 15 >
two external monitors > lag has reduced, workable but not gone, WindowServer peaks to 95%
one external monitors > lag has reduced more, almost gone but still feels like 30fps, WindowServer peaks to 95%, fullscreen-cursor lagging behind, when drawing a rectangle it stutters
tldr: macOS 15 – improvements but far away from being solved