Have you looked in Processes to see if anything is hogging the CPU?
Ctrl/Alt/Del then look under Processes tab, the only item which should be showing 97% or thereabouts is System Idle Process, all the rest should be at no more than 0% to 4% approx.
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This poetic animation about monsters is illustrated in a Van Gogh painterly style
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.