HERE ARE FEW STEPS: FOR MAXIMUM USERS

1.GO TO YOUR GAME AND SELECT VIDEO.

2.PRESS 2 ON KEYBOARD, THEN TRY RESOLUTION AS MINIMUM AS U CAN USE.
(MORE RESOLUTION UR CARD HAVE TO MORE WORK) SO KEEP IT LOW.

IT SHOULD ME 1024 x 768 FOR 17 inch AND 19 inch MONITORS.

-VISUAL TREATMENT SHOULD BE LOW
-RAIN EFFECT,VSYNC AND OVERBRIGHT TURN OFF.
-WORLD LEVEL OF DETAIL,TEXTURE,ANTI-ALIASING,ROADREFLECTION,
SHADOW AND CAR REFLECTION UPDATE RATE TURN THEM TO BLANK.

3.SET CAR GEOMETRY AND REFLECTION DETAILS TO HIGH.

THEN U SHOULD TRY ANTI ALIASING,RAIN EFFECT ETC IF NO PERFORMANCE DISTURBS.

MORE OVER U CAN CHANGE UR SPEED IN MPH OR KMPH
- GO TO GAMEPLAY > UNITS> IMPERIAL FOR MPH AND METRIC FOR KMPH.