Re: pros/cons of installing from source

Biggest contenders for optimisation are the kernel and libc. Most applications are mainly a series of calls to these two so won't directly benefit from by being compiled with *magical* flags.
Debian supply both optimised kernels and to a lesser degree optimised libc packages. Use of SIMD extensions etc is something totally different, and compiler flags aren't going to do all that much there really...

Think of all the dolphins that will die because of the electricity wasted pointlessly compiling packages. ^^

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