ares v126 brings even more improvements to the NES/Famicom emulation by adding support for many more rom mappers. Compatibility for MSX1/MSX2 has also improved as a result of adding heuristics for better mapper detection.
An issue that prevented Windows users from mapping inputs in v125.1 has also been fixed.
fc: support for namco 175/340 boards [encoded-byte]
fc: support for namco 118 board [encoded-byte]
fc: support for Color Dreams board [sp1187]
fc: support for bandai 74161 boards [encoded-byte]
ares v125.1 is an emergency point release to fix a major performance issue that has exclusively impacted Windows users. If you're a Windows users, you probably want to update.
Additionally, it fixes some minor crash issues, implements the GTROM mapper (used by some NES homebrew) and fixes an issue where some roms could not be loaded from a .zip file, these changes would usually have waited until v126, but since they have already been completed, it didn't make sense to hold them back.