@Burr : Thx for the address of the test Robot
My result with a very old computer (6 years old)without multi core :)
Ati radeon 9200 (128 ram video) XP Amd 2600 1.91 GHZ
V1 = 35 seconds
v2 = 6 seconds
Not so bad ;) But I have something running in background so more results soon!

If I * 10 the robot moving in V1 is very hard
In V2 that works fine (thx Proxy)