I use Kubuntu 14.10 Plasma 4. Is there any way to uncheck all desktop effects at once, or do I have to do it one by one?
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No, there is not.
You can totally disable compostion manager with (by default) the
Ctrl+Alt+F12 key combo. But it is not the same as disabling all effects.
If you wanted it for some sort of script, you could do it with manual config editing. Ask separate question for it.