It has many issues and greatly reduces performance of main rendering thread (even when disabled), so for comparing performance use instance without mod installed.
Asynchronous Reprojection is a Minecraft mod that creates second rendering context to asynchronously reproject frames from main rendering thread with new camera rotation and player position.
It was inspired by Comrade Stinger's demo, which was also base for shader code: https://www.youtube.com/watch?v=VvFyOFacljg
Known issues:
CurseForge page: https://www.curseforge.com/minecraft/mc-mods/asynchronous-reprojection
Modrinth page: https://modrinth.com/mod/asynchronous-reprojection