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Changelog

[Unreleased]

Added

points(t, [col]) — batch pixel plot that draws many pixels in a single Lua→C call (the boundary that dominates pixel-dense carts). ~2.4× faster than a pset loop on the DOS build. See API_REFERENCE.md.
Headless, deterministic DOS benchmark/profiling harness under tools/ (Bochs i486 + DOSBox), a per-primitive sweep, and a framebuffer-checksum gate in --bench mode used to prove optimizations preserve output bit-for-bit. See tools/bench/README.md.

Changed — performance (DOS / 486)

Rendering: byte/dword span fills for hline/rectfill, a 256-entry LUT for the framebuffer unpack, 4-side culling in map(), and a sprite/tile fast path (clip-once + single palette lookup + alignment-independent packed-byte blit). The map_ex demo goes from ~12 to ~30 fps on the i486 model (×2.5), with bit-identical output.
Audio: DOS sample rate lowered to 11.025 kHz; the pocketmod _u8 renderer is now integer fixed-point (8.8 level + 20.12 position over int8 samples), cutting music-render time ~55%; mixing sums only active sources in signed space; the audio stream is refilled independently of the 30 FPS draw tick.
Build (DOS): default optimization tuned to -O2 (was -O3), dropped -funroll-all-loops, kept -ffloat-store (load-bearing for x87 determinism). New overridable knobs: MARCH, OPTFLAGS, PG (gprof), OBJDIR/BUILDDIR.

Fixed

cls() now marks the frame dirty, so a cls-only frame is presented.
Audio mixing no longer stacks DC from silent SFX channels (which overflowed the 8-bit mix before the limiter).