R3E Open Beta has been updated

[Blkout]

24/04/2014Game:
- Optimized rendering for better performance when mirrors are toggled off.

Art:
- Updated Zolder for the corner marker toggle.
- Updated Hungaroring for the corner marker toggle.
- Updated Indianapolis for the corner marker toggle.
- Updated Monza for the corner marker toggle.
- Improved performance issues in Portimao.