Another approach to answer this question might be; Have a fantasy-reading friend read what you wrote. Then let them tell you how they found it...
To my mind, a small amount may be required. Not enough to slow the pace of the story, but enough to engender some degree of understanding of...
Dialog certainly has a place in moving the story forward. As to how much is too much, maybe this would help. Write your scene(s), including all...
[ATTACH]
Locutious (sic)
Hitachi
Derby
K.I.S.S. "The Empty Room"
Separate names with a comma.