IMac does not play HD videos (on or offline)

Trying to edit, watch and download videos on the iMac but when I want to view it full screen, regardless of what quality it is playing at (240p right through to 1080p) the video ends up pixelatting and lagging whilst the audio keeps playing. If its at HD, the video will just play pixellated and eventually just not play. Any ideas?

Please post some detailed information on your Mac model, model identifier, processor, etc.
Also, how much RAM is installed?
And, where are you downloading them from?

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