From Mike's Wiki
The simplest command we have, it waits for a single game tick to go by before proceeding. While handy for very short delays, if you need to wait for 3 ticks or longer, use the Pause command.
A simple example of PNop
Pause 80 ; Wait for 80 game ticks before starting the for/next loop PFOR 5 ; Execute a loop of 5 Start SnakePath, Baddie1, 340, 100, KILLCLIP ; Start a single baddie PNop ; Wait for a single tick. PNext ; Next loop