Notable changes since 1.23.0-UNSTABLE:

Added settings "affinity.cd", "affinity.emu", "affinity.video", and "ss.affinity.vdp2" to specify CPU thread affinity masks for the CD read threads, main emulation thread, video blitting thread, and Saturn VDP2 rendering thread, respectively. Setting thread affinities properly can improve Saturn emulation performance on a dual-core CPU with hyperthreading.
Using drive-relative paths on Windows should no longer make a mess due to Mednafen looking for and putting files in the wrong place.
Apple2: Added support for 32-color custom palettes(will automatically enable a text fringe reduction RGB mode if used).
Apple2: Renamed(with backwards-compatibility aliases) video mode "rgb_alt1" to "rgb_alt" and "rgb_alt2" to "rgb_alt_tfr", and added new video mode "rgb_tfr".
PS1: Made minor adjustments to the PS1 pixel aspect ratio and lightgun crosshairs Y position with PAL PS1 emulation. This may necessitate updating any custom per-game psx.xscale/psx.xscalefs settings, and recalibrating the lightgun in-game, with PAL games.
PS1: Added setting "psx.correct_aspect", default value of "1".
SNES-Faust: Added support for Game Genie cheats(entered via Mednafen's cheat system).
SNES-Faust: Added setting "snes_faust.region" to allow for overriding the automatic region detection and emulating one region while reporting the different region to the game.
SNES-Faust: Added DSP-2 and S-DD1 emulation.
SNES-Faust: Added MSU1 support.
SNES-Faust: Fixed hang in "Frisky Tom" in "Nichibutsu Arcade Classics".
SNES-Faust: Fixed audio glitching and hang in "Tenshi no Uta: Shiroki Tsubasa no Inori".
SNES-Faust: Added a multithreaded PPU renderer, controlled via the new "snes_faust.renderer" setting, disabled by default.
SNES-Faust: Added SuperFX overclocking support, controlled via setting "snes_faust.superfx.clock_rate".
SNES-Faust: Added SuperFX instruction cache emulation support, controlled via setting "snes_faust.superfx.icache", disabled by default.
SS: Removed setting "ss.midsync"; the functionality it controlled is now always enabled.

New settings:

affinity.cd
affinity.emu
affinity.video
psx.correct_aspect
snes_faust.renderer
snes_faust.affinity.ppu
snes_faust.affinity.msu1.data
snes_faust.affinity.msu1.audio
snes_faust.msu1.resamp_quality
snes_faust.region
snes_faust.slstart
snes_faust.slend
snes_faust.slstartp
snes_faust.slendp
snes_faust.superfx.clock_rate
snes_faust.superfx.icache
ss.affinity.vdp2


Changed settings:

apple2.video.mode
snes_faust.correct_aspect
snes_faust.h_filter


Removed settings:

ss.midsync
https://mednafen.github.io/