Value In Brief – by Abanoub Hanna
All You Need To Know Explained In Brief

Why built-in functions in python are faster ?

Python Code Optimization why

Because Python is sitting of the shoulders of giants. Built-in functions are written in C and C++ under the hood.

C and C++ languages are efficient and fast, so their functions will be faster than the functions you write in Python. So it is recommended to use built-in functions instead of creating new ones.