ASIO Guard 2.0 comes with 3 “levels”. I’m not 100% sure what buffers are involved, but it’s supposed to be transparent regardless.
This is what the new Cubase 8 manual says:
“The higher the level, the higher the processing stability and audio processing performance. However, higher levels also lead to an increased ASIO-Guard latency and memory usage.”
Maybe the release notes have more information? I’m trying to dig them up.