Thanks to Whatcookie, a patch has been made for NieR Replicant and Gestalt that allows you to run the game at 60fps for the first time, beyond the game's 30fps limit. It's even possible to go above 60fps however the game's speed starts to break. To do this, follow the instructions on our GitHub page https://wiki.rpcs3.net/index.php?title=Help:Game_Patches#NieR you can ignore the PPU Hash instructions since they are already provided in the NieR patch.
Remember that NieR requires Write Color Buffers to be enabled, and the FPS to be capped in RPCS3's settings, use the 30fps cap if you're not using the patch and 60fps cap if you are. Update: previously NieR also required users to change "Sleep Timers Accuracy" to "Usleep" instead of "Host", however with the latest builds of RPCS3 this is now the default setting for all users, and upon opening the latest builds of RPCS3 old config files will be updated. As such, you can skip this step entirely from now on.
RPCS3 presently has 277,777 views for Nier across 3 videos, with his channel publishing less than an hour of Nier content. This is 3.82% of the total watchable video on RPCS3's YouTube channel.