New iMac Specs:

  • Mid-2017 iMac
  • Retina 4K 21.5 inch
  • 3.0GHz quad-core Intel i5 CPU
  • AMD Radeon Pro 555 with 2GB Memory
  • 1TB Hard Drive
  • 8GB RAM

macOS Catalina 10.15.2

It keeps hanging, lagging or freezing with the rainbow cursor for 1 or 2 seconds. Sometimes, even YouTube and Apple Music stops playing for the same time.

It's slow in everything, not just loading/writing on hard disk. I have tried a fresh installation of macOS with no results.

The memory is always empty and 70% of CPU stays in idle. I see no peak in usage on Activity Monitor. The hard disk is not full either. It's just strange. Has this been happening to anybody?

It has been like this forever. Having had a MacBook, I have never really used this machine except for now that I am home all the time.

Here is the report generated by EtreCheck: https://pastebin.com/4hbaLGte

  • 1
    "Has always been slow" like since you got it? Did you obtain new or from a 3rd party pre-owned? Have you tried running Apple Diagnostics (Hold D while booting).
    – Allan
    Commented Mar 24, 2020 at 3:28
  • 2
    @ankii - then why not put the link here as opposed to going offsite to get yet another link? It reads "post results here <link>"
    – Allan
    Commented Mar 24, 2020 at 5:48
  • 1
    It seems to be reporting a failing hard drive issue.
    – AzLimbiate
    Commented Mar 25, 2020 at 19:53
  • 1
    enclosure : eshop.macsales.com/shop/owc-mercury-elite-pro ssd drive: eshop.macsales.com/shop/SSD/OWC/Mercury_6G ( the price has gone up since I bought the pro version ) I got the separate drive since I was planning on swapping out my internal harddrive. Commented Mar 27, 2020 at 19:22
  • 1
    I have a 2014 mac mini with an internal harddrive. The finder was slow, slow listing files. I bought an external drive enclosure and installed a ssd in the external. Was like a bought a new machine. Used carbon copy cloner to copy over startup drive to external drive. hold to option key to pick what drive to boot. Commented Mar 27, 2020 at 19:32

1 Answer 1


It was indeed a Hard Disk issue. I have bought a Crucial SSD from Amazon and a USB 3.0 to SATA III connector. Since then, I have been using this configuration with the macOS being installed on the external SSD. I get r/w speeds of 480 MBps. The Mac runs magnificently. Nothing to complain.

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