If I had say a 100MHz DAC I can't just change the output from 0V to max V in 10ns, at least I think I remember you can't do that in real life. How do you understand what you can do from a datasheet? I feel like I remember reading about this once but I don't remember what it's called. I assume it's load dependent as well and I'm thinking of this in the context of having a 50 Ohm piece of coax connected to the output both source and end terminated.
The word your looking for is slew rate. That is how fast you can change from one voltage to another. It is usually measured I'm V/ns. The DAC should have this is the data sheet.