My husband's an ATC and will vouch that WN taxis fast. Sometimes they get complaints from other pilots that WN is taxing too fast, but there's never been a problem that I or he knows of. This is a time-saving policy of theirs.

All companies seem to handle their planes a little differently based on their objectives - i.e. save fuel, quick turnarounds, etc. For example, some take their time getting to altitude; others climb fast(WN).