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I am trying to have my system as fast as posible and was searching for custom kernels like zen-kernel, for example. But I didn't find any reason to use them, it doesn't seem they make that much of a difference. What do you think?
Zen is supposed to be some kind of universal desktop kernel for everyday usage. To be honest, it's not really that great. It's often best to stick to the kernel provided by your distribution, or built yourself.
Oh, and by the way I am testing Gentoo (what a funny webpage lol) but I am still totally confused (I am not a very skilled linux user but whatever). I like the idea behind it and I like compiling stuff but I don't know if it is worth it and it is definitely not as simple as Slackware.
A new kernel compiled for your processor, will boost performance by a bit. Another thing I have found to increase performance is recompiling glibc, glib, and glib2 using '-march=native' in the Slackbuilds.
It depends, a different kernel can run faster, but usually not because of better optimization, but because a newer kernel may contain bug fixes that speed up the system. For example, kernels 3.11 and earlier had a bug in the ondemand CPU governor that was fixed in 3.12. Under certain circumstances and with specific benchmarks this bugfix could speed up the system up to 90%.
But usually you will increase performance to a much better extent if you rather compile your applications for your specific CPU or GPU. But don't expect wonders from that either.
Make sure the slackware version is right. Then edit the Slackbuild to contain '-march=native' for your architecture or for all if you are not sure. Then you run the Slackbuild as root, wait for it to finish, and then run 'upgradepkg --reinstall' on the package that is created.