Huge number of changes in this release thanks to @emawind84.
For more specific details please see @emawind84 's repos
The big changes in this release are dual wield and lots of performance updates.
There are also fixes to soundfonts and fluidsynth.
Regarding dual wield and soundfonts I explain new API and how to use them in my releases on github:
https://github.com/emawind84/QuestZDoom/releases/tag/qzd3.88-r9
https://github.com/emawind84/QuestZDoom/releases/tag/qzd3.88-r5e