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by xtacy 2932 days ago
I am not a native English speaker, but quite familiar with the use of "at (large) scale" in similar context.

It means that one has deployed it/is using the tool with a non-trivial (could be anywhere from few 100s to few 1000s of machines) amount of CPU and/or data. In the context of serving, "large scale" could also mean the number of queries/second hitting the serving layer.