add entry about performance on Ubuntu 9.10 with the newer GCC
add entry about performance on Ubuntu 9.10 with the newer GCC

Whiteknight/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,Whiteknight/parrot-linear-algebra,fernandobrito/parrot-linear-algebra