difference of job size


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I have a question about the ccsd(t) job size.

Right now, I am running a couple of CCSD(T) single point jobs.
I have 3 jobs dealing with reactant, transition state and product.

Simply those jobs have the same number of basis function, the same number of valence electrons, etc.

I ran them with the same memory and the same number of nodes.

however, the transition state may takes more than 2 times of wall time of that for the reactant and production.

So why is there so much difference?

What kind of factors contribute the job size?

thanks a lot.