Lua in Mac vs. Win

Surprisingly while testing the FF 6 beta in both Mac and Win OSs the following came to light:

The Win machine is much newer and is about 3x faster in all but the Lua scripts in which it is about 2x slower

Filter: Glowing Spiral
Win: 12.21 sec.
Mac: 40.14 sec.

Filter: Raytracing
Win: 14.90 sec.
Mac: 10.20 sec.

Is there some setting in Windows 8.1 to accelerate Lua execution? Some i7 setting?

My machines are offline, meaning they don't get updated, so, another possibility is that the C runtime libraries are too old ???

from http://www.luafaq.org/#T1.40 (Compatibility issues between Windows and Unix):

"Lua depends more directly on the system's C runtime libraries than most scripting languages so you have to appreciate platform differences."

I have:

Visual C++ Runtime 2008
Visual C++ Runtime 2010
Visual C++ Runtime 2012

but am going to install the 'Visual C++ Redistributable for Visual Studio 2015' and see if that helps.

Otherwise if the issue is on your end, perhaps this is helpful: http://luaprofiler.luaforge.net/manual.html

Yes, to reiterate:

NEW Win machine is about 3x faster on:
Filter: Glowing Spiral (and ALL other NON Lua script filters)
Win: 12.21 sec.
Mac: 40.14 sec.

NEW Win machine is about 2x SLOWER on:
Filter: Raytracing (Lua script filter)
Win: 14.90 sec.
Mac: 10.20 sec.

My assumption is that because there is only CPU processing in FF, all filters should behave in a similar manner, so that the new Win machine SHOULD be about 3x faster regardless of lua script or not.


Update: Updating the C runtime libraries doesn't help.