UT2004 is very nice and one of my favorite games. One nice option it has it is possibility to setup the speed of the game. You cannot do it in game itself, however, to do it, you must edit:
I use
UT2004.ini
file in: \UT2004\System
and change the value of variable GameSpeed
Originally: GameSpeed=1.000000
I use
GameSpeed=0.650000
My computer is not fast enough to render the game in its original speed. Moreover, with slower action, it is easier to observe all those special effects that game has - you can observer, e.g., rocked heading your way, which is pretty nice.