I used to be a perfectionist in several areas of my life. I'd call it more of a thought pattern and a learned way of dealing with things. It took training from bosses in jobs and also coming to terms with the fact that there's not enough time available to do everything perfectly to get me to stop most of the behavior.

When I'd be doing a task and feeling that perfectionism sort of feeling (anxiety of a type, I suppose) I would over-focus on the task and feel unable to look at what else was going on around me that might need attention.

It was having certain unrealistic standards to a large extent. I would forget to think about things like "what else needs doing?" "what might be better to spend my time on?" "how much $$ (time) is this task worth?" and especially to pay attention to when something is "good enough".

I think sometimes if someone else doesn't help a perfectionist to learn to shift gears and look past the task they are working on that it can be hard for them to learn to do that.

Sometimes time pressures will make them learn on their own. They have to change their way of thinking to value, say, two "good enough" tasks or projects done in the same time as it would take them to do one "perfectly".

I suppose it may look like OCD behavior. I don't know whether that's what it really is. For me it was more of a case of unexamined beliefs and standards.