I don't know how fast PascalScript actually is but Lua beats even some compilers. According to wikipedia it also uses bytecode:
Lua programs are not interpreted directly from the textual Lua file, but are compiled into bytecode which is then run on the Lua virtual machine.
And since the shared library is built with a C compiler it might be faster than an engine built with Freepascal. I think there was a discussion on the mailing list that GCC beats FPC in speed issues.