Go's memory management system is effective and automates most tasks involving memory. To improve memory efficiency in Go, designers can use four techniques: designing memory-efficient structs by ordering fields from largest to smallest, using pointers for large data structures, managing variable scopes, and pooling resources. Additionally, the Go `sync.Pool` type can be used to manage and reuse instances of objects, reducing allocation costs and garbage collection overhead. The built-in `pprof` package provides methods for identifying bottlenecks and memory leaks in Go applications, allowing developers to profile memory usage and analyze profiling data using commands such as `pprof top` and `pprof list`.