Debuff applications extremely slow

Not sure what’s causing it, but any debuff put onto an enemy by my creatures causes a massive delay/hitch/slowdown between applications. Wormrot is a great spell for this example.

Edit: The slowdown is not present when only one enemy is on the field and is affected by a debuff.

Edit 2: It seems to occur when using the dragon queen’s trait when there are 6 enemies on the field.

Version .22.3
Windows 7