Como explicado nesta outra resposta :
These symptoms sound like a CPU throttling issue that I had. When my laptop overheated, the CPU would reduce its speed (throttle back) to reduce heat output... as a result my CPU % appeared to be low at around 15%, but in fact the CPU had cycled back to 16% of its max and so it was in fact running flat out.
You can diagnose this by using Resource Monitor instead of Task Manager. (Type "resmon" into the Start-Run prompt.) At the top of the CPU tab processes window there is a useful "Maximum frequency" which will reduce as the CPU throttles back.
If this is the problem then you can look at causes of the throttling. You can use free tools like Speedfan to monitor temperature and check on your fans.
In my case there was a definite correlation between throttling and temperature. My laptop was a Dell E6400 and I used a fan assisted cooling tray to assist with the overheating, and I also hit a known issue with this laptop model - see
http://www.xtremesystems.org/forums/showthread.php?240717-Dell-Latitude-E6500-E6400-ThrottleGate-Fix
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Execute o Teste de memória do Windows: Iniciar- > Painel de controle- > digite "memória" - > Diagnostique os problemas de memória do seu computador. Isso executará o diagnóstico de memória do Windows e é um bom lugar para começar.
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Execute o Prompt de Comando como administrador e digite "chkdsk / r" e pressione enter. Siga as instruções. Isso verificará a integridade da sua instalação.
Se você tivesse RAM extra em torno de você poderia facilmente mudar isso e ver se ajudou. É possível que sua placa de vídeo esteja agindo, mas isso é apenas eu tentando pensar em todos os problemas imagináveis.