If your program is working correctly, but you want to make it run more
quickly or efficiently, the first thing to do is @dfn{profile} your
-code that you know how it is using resources. If you find that one
+code so that you know how it is using resources. If you find that one
particular function is responsible for a significant portion of the
-runtime, you can start by looking for ways to optimize that piece.
+runtime, you can start looking for ways to optimize that piece.
Emacs has built-in support for this. To begin profiling, type
@kbd{M-x profiler-start}. You can choose to profile by processor