[Mafarricos]

So now feels like a placebo effect

I've never seen swap being needed on a 512M Pi for xbmc. Perhaps if you have other applications (e.g. torrents) running alongside, but not xbmc on its own.
A 256M is different. You can hit memory limits when using streaming add-ons, and swap may be required.

You can simulate a 256M Pi with "total_mem=256" in config.txt if you want to test the behaviour.

The placebo was about loading time opening a video that I was testing, probably solves on other things.
I have more applications but not using them when testing.

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I think I detected a bug. In all addons settings isn't possible to see any "comment" setting, the ones only with text to inform user of things and grouping labels. This happens with anyone else?

Could you post a screenshot? It could be PR4919, but this was also present in #0703.

In #0703 I didn't change any setting.
I will check on the other pi and see if result is the same or is something that went wrong in this RPI.