From DDraceNetwork

Ticks are the main system governing DDrace's physics. In a DDrace World, all physics instances are calculated 50 times per second - each of these times is called a "tick". Having only 50 ticks per second (tps) leads to some physical oddities.

First Tick

Many interactions are governed by their first tick. For example, a tee will be able to input a jump only on the first tick it enters a freeze (this is what makes freeze jumps possible.)