The way to optimize the buffer is to set it as low as possible and then play back the audio or play the virtual instrument while listening for audio problems. If there are any problems, increase the buffer size one step and try again. Keep increasing the buffer size until the problems go away.
How do I reduce latency from plugins?
The settings you change below will affect the Overall Latency field.
- Reduce the buffer size. ...
- Raise the sample rate. ...
- Disable the Audio Input Device. ...
- Use ASIO audio drivers on Windows. ...
- Use a dedicated audio interface running native drivers. ...
- Don't use Bluetooth devices or cast audio.
How do I fix MIDI latency in Reaper?
The latency is indeed caused by the audio system. If you select the WASAPI as your driver in Reaper (press Ctrl+P to get Preferences window up and change it in Audio->Device. Remember to change the "Block size" to something like 256 or below.) Make sure "Mode" is set to "Exclusive mode" for the lowest latency.