Vive / SteamVR locks to 45 fps and is "choppy" if 'Allow Reprojection' is enabled.

I know the fps capping is part of reprojection (rendering the frame twice), but compared to PSVR, something feels "off" and "choppy". Is the view suppose to update between frames? It feels like it may just almost just v-sync'ing to 45 fps

1. Open SteamVR
2. Settings -> Performance, enable "Allow reprojection"
3. Make sure that the vive is hooked up and ready to go
4. Open QA Game
5. Open QA-Promotion
6. VR-Preview
7. Press the '~' key to bring up the console
8. Input the command Stat FPS
9. Notice that the FPS is showing ~45 FPS

Result: The FPS will either be at V-Sync (90fps), or reproject and "Lock" to 45 FPS.