Is reflex arc too long a low IQ?

It just describes that someone is slow to react, not to the point of attacking IQ.

Reflex arc is a specific nerve structure of human body, that is, the nerve chain that receives external information and reacts. Because it takes time for information to transmit on reflex arc nerve cells, some people joked that the longer the reflex arc, the longer the reaction time of human body.

For example, if A tells a joke, B immediately laughs, and C takes 10 minutes to react and laugh, then you can tease him that the reflex arc is too long!