https://wccftech.com/nier-replicant-mod-fixes-high-fps-on-pc-though-theres-a-catch/

The first real NieR Replicant mod has been released on NexusMods and it fixes the game's high frame rate problems on PC. By default, the higher than 60FPS you go, the faster the game's speed will be. Needless to say, this ruins combat, hence this NieR Replicant mod.

Just download it, extract the files in the game's directory (where the .exe file is located), and follow the installation guide below. Do be mindful though that the mod seems to affect the ability to adjust the player's direction when walking.