Crouch-Jumping:
While not as pronounced as in some other shooters, combining a jump with a crouch can sometimes allow you to clear slightly higher obstacles or gain a small speed burst when moving over uneven terrain. Practice this to see its subtle benefits.
Strafe-Jumping:
Similar to crouch-jumping, combining strafing (A or D) with jumping can make you a harder target to hit, especially for snipers. It's not a massive speed boost, but the erratic movement can save your life in open areas.
Vehicle Bailing:
If your vehicle is about to explode, bail out (default 'E' key) just before it blows. This can save your life, allowing you to continue fighting on foot or find another vehicle. Be aware that bailing from a fast-moving vehicle can still cause fall damage.
Using Terrain for Cover:
Always be aware of your surroundings. Use small hills, craters, rocks, and even destroyed vehicles as cover from enemy fire. Going prone (default 'Z' key) behind low cover can make you almost invisible to distant enemies.
Mastering these subtle movement techniques can give you a crucial edge in firefights and help you navigate the battlefield more effectively, making you a harder target and improving your survivability.