Should I upgrade iMac OS to speed it up?

  gibsteve 10:40 15 Feb 2018

My late 2009 iMac running OS Yosemite 10.10.5 is very slow. Would updating the OS make it faster, or slow it down even more? Thanks.

  HondaMan 21:20 15 Feb 2018

Possibly not. I upgraded through El Capitan to High Sierra and found that my speed actually went down, not by much and not enough to make a difference, but that was on a then top spec 5K iMac, 4Ghz and 24Mb memory

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