Basically, I want to say this:
I went to that place for brunch with my girlfriend last weekend, the service was pretty fast, and the food was good too.
I want to say that the service was good in that it was pretty fast, without a delay, etc.
Synonyms I can think of for "fast" in similar context:
The service was:
I typically hear the phrase timely for service:
They have excellent food and timely service.
Synonyms for "pretty fast":
I would say that the service was swift.
Lightning Service should please the waiter, steward, bartender, manager or whoever served you.
Probably not for food service, but the first phrase I can think of to describe fast is "blink of an eye".