If you work in Timeline mode, the speed of the roll or movement is related to the length of the title.
The longer you stretch the title on the timeline, the slower the roll.
Thanks, once one knows the answer, it is intutive.
Besides the Text Animation Presets, you can also Keyframe the Fixed Effect>Position, to control the speed, add pauses, if necessary, and also to animate a Title with more than one line of Text. I find that the power of doing the Keyframing by hand to be so much greater, that I cannot recall the last time that I used any Text Animation Preset.
When you have some time, I would suggest exploring Keyframing to produce animation in the Titles. Also, all practice will pay dividends, as many (most?) Effects can also be Keyframed to animate them over time.