Disabling the screensaver makes no difference (or no difference that's discernible.
Disabling wallpaper can make a minor difference - but if there's plenty of RAM in a system, it's not worth doing. On a system very low on RAM it might help a little.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
How VR is being used to simulate space
New iPad, iPhone SE & Red iPhone 7 on sale now
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