Okay so I attempted to make manjaro net a cloud is but to be honest there was a multitude of issues with manjaro and my system unsure why hut anyways I have deciding to switch the project to something different let me outline
Arch or Gentoo which is best for pure speed?
Kernel - custom compiled or something from arch list?
Desktop - thinking bspwm ideas? Pref wm over de for speed and keep people who can't use terminal off PC
Possible encryption - Realcrypt truecrypt or something else?
Fastest filesystem - ext4?
Fast/Secure browser - chromium v Firefox And good extensions
Gentoo bases compilation settings using USE flags which affect dependencies, functionality, compatibility, everything basically.
Gentoo's package management tools tend to more powerful and complex than Arch.
Installing and updating takes a lot of time.
Arch:
Packages are provided through a ports-tree system.
Packages can be built from source or using binaries from the repositories.
Arch's package management tools tend to favour architectural simplicity to avoid over-engineering which occurs in Gentoo.
Installing and updating takes considerably less time than Gentoo.
HOWEVER: like all Linux distributions, you can still do everything in Gentoo as you can in Arch and visa versa (probably involving more work).
Kernel:
Custom compilation allows the kernel to be fine-tuned for your particular system.
No wasted modules, unparalleled refinement, options galore.
Gentoo lets you do this when you install, Arch involves a few more steps but is just as possible to carry out.
Everything else I don't know enough to give you decent advice. ext4 is a good option; multi-purpose, fast and reliable filesystem. Chromium and Firefox are equal in my books. But I'm ignorant of any technical differences between them.
Xdroidie, I think you just need more experience with linux to do the things you want to do. When you say "I gave up on Manjaro net edition because there were SOME problems with it", that means you didn't bother solving the problems (or even diagnosing the problems) and learning from it. The truth is, if you want to have a custom super fast linux install, you have to know what does what. That takes time and experience, and a whole lot of problem solving. You would be better off learning from problem solving with easy to use distros first, then move up to more complex systems. If I recall correctly, you gave up on Sabayon also because you had problems using the bootloader, but you didn't even figure out how to look at the logs or system messages... just slow down a bit and take your time to learn, it's not like you miss out on stuff using a standard Manjaro or whatever else linux distro, they're 1000x better than using a software console. Enjoy the luxury of linux while learning. I don't usually use custom compiled distros myself for production or daily use machines, because it's not convenient. There is little actual use benefit in a custom distro, it's something that members of the linux communities do for debugging and development purposes mainly, because testing and experimenting is part of the open source system.
I see your enthusiasm for linux, and it's great, but it takes time to feed the penguin lol... don't skip the phases of the learning experience, you'll regret it later, there is a lot of fun to be had in the learning process. Linux is a constant WIP, the learning is never ending, it's like a game where you constantly level up as you vanquish the bosses on the different levels, but you can't skip levels!