Eve dont use enough RAM

Hi, since 2 days eve do use the normal amout of RAM. in average in the past it used between 600-800 MB RAM, now it use up to 400MB and it lags… Ressource cache is enabled. what can i do?

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i have 32 GB RAM Core I7 HQ6700, GTX1070

thanks for help, if someone can…

this is total random…

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why it work now again?..