Oxygen Sensor Slow Response - High Altitude?

I figured out how to add the bank 2 sensors to the O2 Sensor Voltage gauge display. So based on what I THINK I have learned, here is what I THINK I see:

Photo 1: Just started car. O2 sensors are not yet warmed up and functioning.
Photo 2: B1S1 has come on line and is cycling. B1S2 is cycling but much less. I THINK this is what I want to see. The sensors are working and the cat is working.
Photo 3: Hello S1B2. Still good.
Photo 4: Engine speed up to 3000. I don't know what the time axis on the gauge is but judging from the speed that the display moves, this looks like a long time without a proper reaction to the engine speed increase.
Photo 5: Engine speed dropped off momentarily then back up to 3000. Getting some O2 reaction now but it seems slow.

So, I THINK the O2 sensors are working and the cats are working. Bearing in mind that the codes I'm getting are "Oxygen Sensor Slow Response" for all four sensors, I THINK they are working but are just not working as quickly as they are supposed to. Or .... maybe its the ECM that is not reacting quickly enough. But the codes seem to be trying to specifically implicate the O2 sensors. From what I THINK I have learned, when O2 sensors get old, they get slow. Or maybe someone put some contaminant through the fuel tank before I bought the car a year ago.

So I'm thinking, for the relatively modest expense (by Ferrari standards), just replace the O2 sensors.
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Photos 3 and 4.
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Photo 5
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