I have a late-2009 iMac, the specs are in pic below. This machine got a new hard drive last year and is running 12GB memory yet it often lags and is not as zippy as I would like. I am curious if there is anything that can be replaced or upgraded to make it perform like a newer machine or are the un-upgradable parts just too long in the tooth? Thanks for the advice.



[![Specs of my iMac][1]][1]


  [1]: https://i.sstatic.net/2ycxR.png