Well, to increase priority for a process, you need to be root. So it's often easier to decrease priority for everything that doesn't need it. But if you have root access, the same command applies, just renice -n -5 [X11 process ID], for instance. The mnemonic is that you want X to be less "nice" to other processes, that's why you decrement the niceness (i.e. -5, not +5). Standard nicing does a +10, so you may want to try -10 if -5 doesn't have a sufficiently big effect. Be mindful of using large values (-19 and +20 are the limits afaik) because you can grind your system to a virtual halt that way.
Samsara
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