Windows 8.1 just like Windows 8 shows different transitions and animations while performing different tasks on the Modern-UI. These animations make the Modern-UI experience more good looking but, some people don’t like those transitions and want their Windows user experience to be simple and plain.
Windows 8 didn’t have the option to disable those animations but, Microsoft has included the option to disable all those transitions with just one press of a button in Windows 8.1
If you want to disable the transitions of Windows 8.1 Modern-UI then, follow the instructions below.
• First of all, go to Start Screen by pressing the
Start button and type ‘
PC Settings’.

• ‘
PC Settings’ should be shown in the results. Press it.
• Your ‘PC Settings’ app will open. Here navigate to ‘
Ease of Access’ > ‘
Other options’.
• Your ‘Other options’ tab will open. Here you should be showed two different options.
•
Turn off the switch named as ‘
Play animations in Windows’.

• Now, all your transitions of Modern-UI have been disabled. Pressing any app or performing any function would be done without any transition or animations.
source:windows8core