How do I configure Microsoft SQL Server 2012 Express Memory Management for best performance?

I need to minimize the amount of RAM it is using while maintaining performance.
My SQL Server is adding RAM usage everyday, below are my settings:

SQL Server Memeory Configuration
rhservanAsked:
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Melih SARICAOwnerCommented:
every edition of SQL Server is a RAM monster so.. what  u need to do is keeping it as low as u can is the best think i ve seen today.. If it needs memory then u can add some..

If ur in production what i advise is keep atleast 2-3 GB for OS requirements, For authentication, for other network services and etc.

What is the size of ur DB ur using ? half of it can be good for development purposes but dont forget what said above
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rhservanAuthor Commented:
I  have attached a file which has run for about 5 days which contains the memory stats grabbed between 4AM and  8AM when report subscripts run.
SQLMemory.txt
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Melih SARICAOwnerCommented:
As i said be4. SQL server get all the memmory of the system if u dont set max memory option
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rhservanAuthor Commented:
What happens if sql server hits the threshold of the sql server max setting say 8GB
of 12GB total memory which leaves 4GB for everything else.  What happens then to the performance once sql server hits the threshold.
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Melih SARICAOwnerCommented:
Nothing ll happen. SQL server keep running.  If u u do ave 100's of connections and queries in a second on a >100GB database then u ll need some extra mem .otherwise SQL server will arrange that for u ..  If u ll ave some latency in query response time maybde u can decide to add some more mem.
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