I decided to see if there was any difference in the speed of various Lua implementations, so I wrote a simple loop that runs for about 1 second and counts how many times the loop can run in that time.

i=0 now=os.clock() while os.clock() < now + 1 do i = i + 1 end print(i)

TPT: 10,923,792

GMod (Chromium branch, and a ton of addons loaded): 11,922,030

HexChat (x64, Windows): 20,557,857

Browser Lua implementation (ran in latest Google Chrome): 252,807

EDIT: Updated the GMod score due to finding it was not being executed in the same manner as the others, which deflated its score. It is more accurate now.