I guess it all depends on your definition of 'Noticeable'..
When I looked at the film "Stars and Watercarriers", & before the Time Trial days,
no wing shaped Time trial-special bikes then,
the team mechanics cleaned and re did the hubs and BB bearings,
on their racers bikes, to make sure there was best possible performance.
that day , from their team's men , so it must have mattered to them, at that time.