Hmm. Intervals.icu will only smooth the velocity data when there are more data points than pixels on the display so mostly it is presented as is. If you download the “Ride CSV” (https://intervals.icu/activities/5222605513/data) you can see it is all over the place. The “velocity_smooth” column is what was received from Strava.
Maybe I should smooth the velocity data for runs or at least make this an option?