Glad to hear it; you're welcome.That really depends on how much time your application spends in the libraries and how much in the armcc-built code. Profiling with something like DS-5 Streamline or oprofile is probably the right place to start. If you find out you're spending a lot of time in the libraries (for example memcpy) it might be worth trying to use those functions from the RVDS libraries -- but it can be messy or impossible if the library functions are OS-dependant (file i/o, signals, sockets, ...).