un

When doing a clean install of the Final last week, I reformatted my HDD back to HFS+ after using APFS since around DP4 or DP5. Several weeks ago, I had read the following article (which, I think, was linked in a previous post here but can't remember by whom or when): Using APFS on HDDs... and Why You Might Not Want To The points made in the article seemed to become evidently obvious on my machine after using APFS for several weeks: My installation of Mojave Beta grew increasingly more sluggish over time -- until, finally, it became unbearably slow to respond. Apps would take forever to open, as would preference panes in System Prefs. Particularly slow was opening a data file by double-clicking on it to open it directly into an application.Since reformatting to HFS+ and installing the Mojave final release, my Mac has become extremely fast again. It boots in one-third the time it did under APFS and many applications open almost instantly. I will have to see if even this setup starts to slow down as time goes by but I suspect that it will not slow down as much as it did when trying to run Mojave on an HDD with APFS. I just don't think spinning platters and APFS are a good match.I realise this may mean that I will lose software updates via System Preferences (although there doesn't seem to be any certainty that this will be true when reverting to the standard update scheme, as I have nowenrolled from the beta program) but I think the trade-off will be worth it in order to have a faster-running machine.