1. As many approximate calculations

as possible. For example, in a computer, the cost of multiplication and division is far greater than addition and subtraction. Then we can perform approximate calculations similar to the following figure

2. Try to use **LUT lookup table** as much as possible

3. Threshold calculation

4. Minimize unnecessary CPU calculations, such as reducing floating point calculations

5. See if there is any pre-calculation or approximate calculation when deriving the mathematical formula