I worked on a startup that was mostly powered by Tcl, the amount of rewriting in C that we had to do between 1999 and 2003, when I left the company among all those dotcom busts, made me no longer pick any language without at least a JIT, for production code.

The founders went on creating OutSystems, with the same concepts but built on top of .NET, they are one of the most successful Portuguese companies to this day, and one of the few VB like development environments for the Web.