What about Gradient Lag?

Btw, for me it is pretty obvious that this is a software "problem".

According to this page Barometric Altimeter Accuracy on an Edge Device | Garmin Customer Support the barometric altimeter have a precision of 3 meters with every measurement.

Seems to me that Garmin is using a very long smoothing period to avoid completely wrong measurements.

I'm not saying 15s is a good value to use as a smoothing period.

But what could happen in worst case if they calculate gradient every second? It could be that on even a flat road while riding 10km/h it would show a gradient of 220%.

Every two seconds: With 10km/h the worst case would be 111% in worst case.

Let's do 5 second: 44%

10 seconds: 22%

15 seconds: 15%

On a flat road! Just because of the precision of the barometric altimeter!

This is also what DCR has posted on his blog. Garmin is sometimes slower, Karoo is often quicker, but Karoo is also more often showing the totally wrong gradient.

And as Sensible Grade does, it would be nice if Garmin gives the option to choose the smoothing period. So people could choose to either have a fast calculation or a correct calculation.