Excess pause bug

Consider $f(x ; \theta)=\theta^{-2} x \exp (-x / \theta), \quad x>0$. There is an unusually long pause before the comma. If this is extraneous and was an error, feel free to fix it. If however this pause length in this case is intentional, I'm using ESpeak-NG at 35% with rate boost enabled and relative speech rate at 60 and pause factor at 50 and I moved on to the next line the first couple of times before the ",x>0" ending.