> - use of weak symbols to detect whether a process has some library loaded RTLD_NOLOAD > Dynamically-linked programs will load faster when their dependencies

> - use of weak symbols to detect whether a process has some library loaded RTLD_NOLOAD > Dynamically-linked programs will load faster when their dependencies are already loaded in memory, and slower otherwise. The biggest win here is the C library. RTLD_LAZY, though it's one less attack vector to have RTLD_NOW and mprotect your GOT and PLT as readonly.