Data transfer speeds are frequently used in fiction as a way of establishing tension between a desire to do something and a time limit. If you had unlimited data transfer, you could accomplish various tasks instantly and not have to worry about the bomb countdown or whatever. So using them is not only realistic, but useful!

Just be careful not to get too specific about what the transfer speeds are in real units, and let the plot drive how long it takes to do something.

Transcript

Lando: R2! How's that hacking going?
R2-D2: I've developed a new compression algorithm on the fly which I'm uploading to speed up the data transfer.
[SFX]: < doop bleep beepop bwoop-ba-bleep spip-pating bekuku spip-pating >
[SFX]: Pow! Pow!
[SFX]: Kaboom!
[SFX]: Kaboom!
Wedge: Do we have time for that?
R2-D2: We don't have time not to do it.
[SFX]: < boop nip boop bleep >
Arvel Crynyd: You see time differently when you've been frozen for 30 years. Dib would have been 61 next week.
[SFX]: Pow! Pow!
Wedge: We're eating these PIEs for breakfast, but there are more incoming!
R2-D2: Don't forget to leave one for me.
[SFX]: < pip-deep ziting bip doop >
[SFX]: Kaboom!
[SFX]: Kaboom!
[SFX]: Pow! Pow!
Wedge: Maybe they think we're too full to handle them.
Lando: I don't think they know about second breakfast. We're about to serve up some justice.