Ask HN: Favor performance after resignation or success in next job?

I joined a company 7 months ago. I like the company and my co-workers a lot, but my manager and I never got along. When he gave me a negative review for reasons that had nothing to do with performance, I took that as a cue to run like hell and decided to get another job. That worked well and I'm moving on to a position that's definitely a better fit. So it's a happy ending, and I put in my notice today and my last day will be the 23rd.

However, I may want to come back to this company in a few years (probably in a more senior role and definitely with a different manager). And I'm going to need a colleague as a reference.

The question is: assuming I don't piss anyone off, does it really matter if I get anything done in the remaining 90-odd hours of work? Or am I better off optimizing for success at the next job, by learning the new company's technologies and relaxing well enough to show up refreshed and ready in the new position?