Video and display having artefacts

Hi
For the past week or two (maybe its because I am in Greece and the temperature is 36°C and the CPU temp is at 80°C most of the time).
But when I have been capturing video and doing anything that uses a lot of the CPU it seems to have artefacts or stutter on video playback, or the video freezes and the sound continues, etc.
Even on YouTube, etc.
Anything I can do to help this? Zap the VRAM/PRAM??
Thanks in advance

Have you tried the basics?

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