Eu recomendo usar a Ferramenta de monitoramento de confiabilidade e desempenho para ver se seu sistema está com falta de memória, especificamente a seção de memória. Procure por falhas graves / s :
A hard fault (also known as a page fault) occurs when the page of the referenced address is no longer in physical memory and has been swapped out or is available from a backing file on disk. It is not an error. However, a high number of hard faults may explain the slow response time of an application if it must continually read data back from disk rather than from physical memory.