Did not assume. Asked, maybe the other distros are old versions. Not sure why else there would be a huge difference... maybe flatpack/snap dependencies not in fs page cache.
Ok, sorry for assuming your intent. No, its nothing like that. They are all the distro provided stable versions installed as "regular" applications.
And it seem to be the start up process that differs, as putting them all in a ram-disk does not alleviate the issue, and restarting the app cuts the time in ~1/2 but equally for each distro.
My guess, as I said first is what default libraries as loaded, and possibly how they are configured. I do however find it strange that this has not been mentioned elsewhere as I've been struck bu this difference for years, when I happen to load a pure Debian install (not what I usually use).
