Think this would be a good feature which should be easily integrated in the mapping plots.
1) Have the GPS trace (viewable in activities) colour coded according to speed, heart rate or cadence etc
2) Scale that colour so it appears red at the high speed (or other) and blue at the lower speeds.
This makes it easier to assess where you were quick on a course and where slow (rather than having to rely on a plot of location vs a separate graph playing at the same time which currently exists). The play feature currently used is very clunky, smooths the data far too much and when anything longer than a 30min workout is involved doesn't capture the detail.
This would be particularly useful for athletes on unfamiliar courses (where they don't regularly train) to see where their slow sections were on the actual map (rather than having to refer to a separate graph).
