My iMAC is running super slow, have restarted it several times and makes no difference

My iMAC is running super slow , have restarted it several times and makes no difference ?

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
Macintosh OS X Routine Maintenance,
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Five Mac maintenance myths, and
Myths of required versus not required maintenance for Mac OS X for information.

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    ATV is wireless.  DNS is set to Auto.  It's not my network. 
    The ATV's performance with Netflix (only App I tried) was worse using Google's DNS as others have suggested.  The problem with the Netflix App (for me) only occurred after the latest iOS update to ATV, and it seems to have affected only the Netflix App. 
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    I am unable to open PDF files or run adobe flash when its needed I have downloaded it several times and tried updating it. NEED HELP

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  • HT1430 there is a lock icon on my Itouch 2nd gen, screen and i cant get rid of it i have restored it several times and restarted it several times also

    there is a lock icon on my Itouch 2nd gen, screen and i cant get rid of it i have restored it several times and restarted it several times also

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