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normal flying around i get around 30FPS, in the save screen i get 60 FPS but in the F8 screen i get 5 or 6 FPS. is this normal?
At the moment it is, yes..
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how come a market screen is more graphic intense than flying to a station ?
From what I've read here and in the dev messages via Github, it comes down to inefficiencies in the text rendering code. I believe this is currently in the process of being sorted out.
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next question is GRUB gives me the option of a 486 or 686 version t boot into. i have been booting into the 686 version . Is this correct for a 32 bit atom? or should i boot the 486? and whats the difference?
Your Netbook is the one with the 1.6 GHz Intel Single Core 32bit Atom N270 CPU, going by what I can find online? And I suspect that the 686 version you mention is actually 686-pae?
The short answer is that if one was actually
incorrect for your machine, it wouldn't boot up. So if it works, you're good to go. PAE, or
Physical Address Extension, (assuming the version being offered at boot is actually 686-pae), is a method of enabling 32bit CPUs to access more than 4GB of RAM.
Since you probably don't have more than 4GB installed anyway, it probably doesn't really matter which kernel version you boot.. though there are some rather odd internal differences between the Atom and a standard CPU, so you may (or may not) detect some performance differences between the two kernels. I'd suggest some experimentation may be in order.