I had to remove a couple optimizations, so the speed is just over 9%.  Some of that can be gained back, but I'm hunting down another bug that has been around for a while.  The expression evaluator hasn't been changed, but it appears to be malfunctioning at times.  This is likely to be something in the math library, or s related to switching from a line number to a line pointer.  It could take some time to track down.