iMac mid 2011

My iMac has been great for 5 years, but it has been running really slow lately.  What can I do to speed it up?  Can I replace the processor?  Thanks in advance

How much RAM you have in it? Mine has 12 GB of RAM and works very well. Boot and application loading of large span is a little slow because of the mechanical hard drive, but that could be replaced with an SSD. RAM is the cheapest, easiest way to improve performance, depending on what you use on it.

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