If you click on the icon of an defense, you can see which values are influencing this tower. The Fissure also shows defense speed, but neither the gambit or the shard for speed increase having any influence on the actual speed of the fissure, the damage ticks are always the same.

Steps to reproduce:

• start the game
• place a fissure near a dummie without points into the gambit and shard
• place a fissure near a dummie with points into the speed gambit and speed shard
• notice no speed increase

Expected result:

The fissure gets an speed increase from the gambit and shard.