JDOD
therecordingrebels.com
The thing in the top right of Reaper says 43/157ms. Now I wouldn't have thought 43 would be noticable but I bet 157 would be. In fact, I think it was a forum member who told me to expect latency if I monitored in Reaper, so when I tried it an found out I had a latency issue I didn't investigate further.