we do loads of car spots in Motion from beginning to end.
I can say without hesitation that the text engine in motion slows renders immensely.
for our disclaimers blocks, I will routinely save those items out as Stills with alpha after I set them and place the images in the comp and mute the original texts objects (in case I need to go back and edit)
this is apparent if you have shadows, edges, and what not applied in the object.
having to calculate essentially the same information over and over again is pretty wasteful…and motion is not that good at it to begin with.
so if what’s happening within the text element is basically static and then you are manipulating the group…
follow this practice and you will see your render times drop dramatically…
Alex