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Hi. The performance of my 2015 iMac has been steadily degrading over the past year, and I would appreciate sound advice on how/what I can do to improve the situation. I changed my disk drive to Kingston HyperX Digital FURY 120GB SATA SSD and still having the same problem with the system running macOS High Sierra My EtreCheck Report: https://docs.google.com/document/d/11mnG… Thank you in advance! Update (02/06/2021)

Hi Dan Thanks for your answer Please check the attachment image, unfortunately, didn’t show any error, and my system running slow.

Your system is a bit limited here. 3.1 GHz i5 (i5-5675R)8 RAM What are you trying to run? With no errors being reported at the hardware level that limits the issue to OS and application issues.