Update

optimization.md

@@ -6,7 +6,7 @@ Optimization means making a program more efficient in terms of consumption of so
 
 These are mainly for [C](c.md), but may be usable in other languages as well.
 
-- **Tell your compiler to actually optimize** (`-O3`, `-Os` flags etc.). Also check out further compiler flags that may help you turn off unnecessary things you don't need, AND try out different compilers, some may just produce better code.
+- **Tell your compiler to actually optimize** (`-O3`, `-Os` flags etc.). Also check out further compiler flags that may help you turn off unnecessary things you don't need, AND try out different compilers, some may just produce better code. If you are brave also check even more aggressive flags like `-Ofast` and `-Oz`, which may be even faster than `-03`, but may break your program too.
 - **[gprof](gprof.md) is a utility you can use to profile your code**.
 - **`<stdint.h>` has fast type nicknames**, types such as `uint_fast32_t` which picks the fastest type of at least given width on given platform.
 - **Actually measure the performance** to see if your optimizations work or not. Sometimes things behave counterintuitively and you end up making your program perform worse by trying to optimize it! Also make sure that you MEASURE THE PERFORMANCE CORRECTLY, many beginners for example just try to measure run time of a single simple function call which doesn't really work, you want to try to measure something like a million of such function calls in a loop and then average the time.