While running Avogadro 1.1.1 on a MacBook Pro, OS Yosemite (10.10.5), optimization of something as simple as butane is slow and hesitant. It takes several requests to optimize before it does optimize when changing constraints, e.g., torsional angle. It gets there eventually, but this is not how it used to operate.
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I am using Avogadro for a class, and the slowness of the optimization for simple molecules is frustrating my students (and me). What is happening?
First off, I'd suggest posting an e-mail to the mailing list, since we can't reply back.
Secondly, I don't know what would change - did you recently upgrade OS? It works just fine on my MacBook pro.