@KingKong

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It obviously can have a tremendous effect if your programm needs fully loaded (DLLs, etc.) only 10 MB instead of 50 MB for (nearly) exactly the same tasks.

ok, so for windows, we would have task taking 1GB with 50MB overhead, and on Amiga port, 1GB with 10MB overhead. Big deal.

Of course you cannot directly compare smaller "more efficient" Amiga programs (like, say, YAM) to fully featured alternatives (Thunderbird). No-one cares if they use less resources, if they are otherwise unusable.

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Even a filesystem can make a relative big difference

Very true. So let's wait if we will get a good one (by modern standards) for Amiga like operating systems some day.

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I don't know exact numbers but maybe AmigaOS can do (in the future) everything what MSwindows does with only 20% of the installed code amount and surely this will have some effect on speed and power consumption.

No-one cares if same code could run 20% faster. They just buy 2x faster computer (for cheaper than X1000, mind you) and be done with it.

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The EU spends billions (10^9) Euros for MS and Intel so it makes big sense to develop an own OS. Think of all the saved money in industry, military, science, office and homecomputing when there is a good (bugfree, fast, small, real time capable) OS for everything and everyone.

That's very true. And I can see 2 realistic solutions to this:
1)Keep investing in Linux. Already a proven OS. No ownership issues.
2)Take some already existing OS that's (almost) good enough. F.ex. QNX might be one choice.
3)Develop "own OS" from scratch. Make sure there are no issues with ownership etc. Make sure there are no nasty license fees involved.

Unrealistic solutions:
4)Invest in AmigaOS. Do significant code changes so that end result will be more work than (3), lose all Amiga compatibility (which mainstream doesn't care about anyway) but still end up having to pay license fees etc.

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It's not so that MSwindows and Linux are perfect and unbeatable - Amiga can do better.

Whatever you say. The problem is, a "written from scratch" OS could do way better than all choices mentioned, and might actually be easier than "modifying AmigaOS into modern enough OS"