Two secondary mitigations for the DSI underrun (the primary fix is the reduced DPI clock in the BSP). Raise LV_INV_BUF_SIZE 32 -> 128 so the busy rain states stay partial-redraw instead of collapsing into a full-screen redraw, which dumps a ~1.3 MB PSRAM write burst that competes with the DSI's continuous framebuffer read. Advance the matrix rain every other tick (doubled step, visually identical) to halve how often its ~80 labels invalidate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LKPbR6DY2JygHbyLjxm7Uu