The body::before scanline overlay (position:fixed, z-index:9999) requires
the compositor to re-blend over the section every time a CPU repaint
happens inside it. Hover state entry/exit triggers these repaints, causing
a visible blink as the compositor flushes.
Fixes:
- Add will-change:transform + transform:translateZ(0) to ascii-frame-outer
to promote it to its own GPU compositing layer, isolating its repaints
from the scanline compositing pass
- Convert corner-pulse and subtle-pulse from text-shadow (CPU repaint)
to opacity (GPU composited) to eliminate continuous repaint pressure
inside the section
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Jared Vititoe
368ad9b48e