macbook 2016 - 4k lags

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my new MacBook Pro 2016, with 3,3 ghz + 16 ram can't play 4K without lagging.

this is mkv files - I tried with many different players that should make it + different mkt files.
(5k player, cisdem etc)
mkv 1080p works
streaming 4k on youtube works

the processor activity of 4k media players are 200 - 300% when playing the video´s.

I tried to reinstall Mac OS, + erased the hard drive & so on... nothing works

what should I do?

grateful for help, best regards
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