Go Performance

Expert guidance for writing efficient, high-performance Go code.

Quick Reference

Concern	Solution	Impact
String concatenation in loops	strings.Builder	O(n) vs O(n²)
Repeated allocations	sync.Pool	Reduces GC pressure
Large byte slice to string conversion	unsafe package (carefully)	Avoids allocation
I/O operations	bufio.Scanner/buffered writers	Reduces syscalls
Defer in tight loops	Move defer outside function	Prevents memory buildup
Premature optimization	Don't do it	Measure first