We can't get the most of the robot and its sensors. Others teams are following the lines faster than us. What can we do?
Basics for Line following with one and two Light/Color Sensors
First, learn to use the light sensor. After that, there are basic algorithms for the sensors, like bump, 3 states, 5 states
More advanced topics for faster following of lines
Calibration is very important. Then you can implement PLF(Proportional Line Following). You can also use a state machine is the line has gaps

Gapped and Crossed Line Following with LEGO Mindstorms
This is a course for following lines that are crossed with other lines and have gaps. We start with a simple introduction of our strategy, the programming that is used and how it follows a State Machine programming pattern. The idea of the course is for students to learn how to program robots to follow a line and to use mode advance state machine programming.