Exwide is too slow

[gandaoyang]

When I was trying the Exwide Developing Version on my computer, I found that it was too slow to run fib(30) with following code:

func fib(num) {
... if (num == 1) { return 1 }
... if (num == 2) { return 1 }
... return fib(num - 1) + fib(num - 2)
... }
fib(30)
I strongly think that you should improve it as quick as you can!