I searched a bit for this and it seems it was previously reported as a suggestion when it’s pretty clear that it doesn’t seem to be intended behavior.
Basically player scaled pets like blade spirits, whirlwind and guardian of empyrion do no receive the player’s move speed bonuses causing them to visibly lag behind the player and causing them to often have a delay in engaging in combat or difficulty in keeping up with enemies moving around.
It seems like a good opportunity to address this before the new dlc is out.