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STM32F103G: Runtime clock changes

Question asked by Jeroen3 on Feb 10, 2015
Latest reply on Mar 26, 2015 by Clive Two.Zero
Currently I'm developing a battery powered application with lcd and stm32f103 (1MB).
Because a full screen update is ugly-slow on 32 MHz I'm looking for ways speed up to 72 MHz. But since this doubles the current consumption, it is not desirable to stay at 72 Mhz.

What is the best way to dynamically change the clocks?
Changing the PLL or changing the AHB dividers?
Or is is not recommended at all?

I've never used dynamic clocks before. Usually they are set & forget because it is a rather complicated habit.