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You can disable active listening by how you start it.
$ startx -- :0 -depth 24 -nolisten tcp
Which is the default for many distros anyway. Of course this breaks things like Xdmx, and X forwarding. Wayland is supposed to make the X model less network based. I'm not sure what mir brings to the table. Not that any lightweight window managers currently play well with such things.
As far as performance, I've found that cwm works for me. Or something like dwm. You don't really double performance, but an extra 5% is something that gamers pay thousands for. One other trick is to launch resource hogs with a high nice level from the command line.
$ nice -n 10 firefox
By default everything that launches under X runs with the same priority as X (priority/nice level 0). Which can have some performance contentions IMO. Running buggy browsers with a lower priority lets you switch to other things with a higher priority to kill the buggy browser. And helps to get you back to business quicker.
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