It seems my previous post was slightly misunderstood. I know about functional languages for years. I think my first real experience with them was when I tried out Clean on Windows about 8 years ago and gave up after one week. As I wrote here, for example, I refused to switch my brain to "alien" functional mode.
The point of my post was that now I am trying again. And that I was surprised that functional languages could be FAST. Of course, my brain is still refusing to switch to functional mode. It's pretty hard after all those years and it's nothing more than "fun exercise" for me at this moment. Currently, programming plays no part in earning my living (last time it did, SmallTalk saved me).