Not enough Memory
I have 12 GB of memory on my iMac 21.5" Late 2009, but the memory often drops to below 100 MB. How can I speed up my Mac? I know that I can add 4 more GB of memory by upgrading the two 2 GB memory modules. Is there another way? I have OS X ElCapitan
VIN,iMac (21.5-inch Late 2009)