With the last firmwares both beta and official, I have noticed an increase in the consumption of battery. Is it happening to you too?

Not me.  Maybe just the heat, or wind.

I lost about 2 minutes from the new firmware

Is that 2 minutes on a battery with 0 charges or a battery with 65 charges? Are you comparing a newer battery flight time against an aging battery flight time. If you notice, every time you charge your battery the maximum charge in Amp Hours lessens, which shortens the length of your flight. So my question is how did you come upon this 2 minutes differential in flight and can you positively attribute it to the firmware update? If so, show us how you concluded that the 2 minutes lost was due to the firmware, directly. Flight times should increase if you turn off video filming and fly in ATTI mode. And subsequently decrease if filming in 'P' mode and filming. There are many factors to cause different flight characteristics of your batteries. I would like to see how you came up with this 2 minutes lost, so I can test it for myself.

What model ? P3 / P4 / Mavic ????  On the P3 - no change

Wonder if it is related to the "CPU Overload" message?   Something cooking them someplace?

Could you be more specific of the issue? I'd like to check.