I posted taxi at a speed that a man can walk.
I've seen 10 knots as max taxi speed (per ops manual) for planes with INS readouts...5 knots in the gate area.
30 knots is a bit fast...especially with FA's in the back...have to stop? all would fall down and YOU have paperwork...I HATE PAPERWORK.
Southwest taxis too fast. I've even heard someone call V1 while taxiing!
the industry is falling apart...and just to remind people, it was a management pilot that crashed an american md80 at little rock. get my drift?