Wouldn't it be slower in lua if C was converted?

I think C being converted to Lua would have many problems. Speed would probably be an issue, but there are so many features that Lua could not support. I'm not too familiar with either C or Lua, but it seems this wouldn't work.

Secondly, njaddison. You should put that userbar into your signature. That way it's attached to every post, so you don't need to copy and paste it every post.

It also depends. Although the converter may work, it is a matter of how efficient the code it produces is. Also, what may be good design in one language may not be good coding practice in the other, thus producing overly bloated code. Just some things to keep in mind.

Converting lua to C is pretty easy as Lua is programmed to be easily intergrated with C.
Converting C to Lua however is a much bigger task, because:
1. It has many different types of variables which are not available in Lua.
2. Most programs access specific stuff (screen, timers, etc) which you can not do from Lua.
3. If you can bypass these limitations, speed would be a very big issue. My logo interpreter just runs at ok speeds, but C is a billion times more complex.

So in short : C to Lua is not possible.
Of course, you can convert some programs manually, but thats another case