The answer have come from Mud:
You should see minor blips in both CPU and memory. Lua's memory consumption will vacillate up and down as garbage (memory taken up by dead, inaccessible objects) accumulates and is then collected. But you shouldn't see that much here; you're not pushing it at all. Imagine how many tables are created per frame in in World of Warcaft client with 50 addons running during a 40 man raid fight...