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What is the best operating system for my iMac that has a Mid-2010 build version 10.13.6
10.13.6
As a general rule of thumb I think the penultimate supported OS is usually the best version for any given device (10.12.6 for a 2010 iMac), but since you are already running 10.13 I wouldn't downgrade unless 10.13 is giving you problems.
10.13.6
It is the last upgrade for a mid-2010 iMac.
best operating system for my iMac
