Significant System & Mouse lag after high sierra install

Thanks for your help - as suggested I tried using the keyboard to wake up the screen and it is a little quicker than the mouse, although still not back to how it was before the High Sierra upgrade. My main issue though is that Apple are one of the largest and richest companies in the world and should be putting more resources into checking these upgrades more thoroughly before they are released to the public. It's shoddy and unprofessional to expect their customers to find workarounds for them. Anyway thanks again :-)

Thanks for your quick and comprehensive reply - it's much appreciated.

- Having investigated the fan problem again, some people advised cleaning the fan ventilation slots with a soft brush and and this has actually cured my problem for now. Low tech, but effective!

- I'm about to do another TM back up and hopefully this will be quicker. I suspect that the reason for the slow backup may be my several thousand photos reorganising from iPhoto.

- I had already checked app settings and had nothing in the list. I suspect it is more related to the way I close an app down. If I use a right click and quit rather than the X I've round it seems to avoid the problem.

- I'll get the new update after I've backed up 😁

Yep - will remember to give it a regular dust in future.

My TM backup is now back to normal and took only 20/25 minutes as it used to. It's a shame that Apple can't issue more information about possible problems following an update - just to let people know what to expect. Maybe they think this is just inviting criticism and will discourage people from carrying out an update... or maybe they just didn't test it with 17K + photos and didn't know the impact it would have. Just as well we have these forums 😉

You’re welcome :)

Why is this a problem in High Sierra when it was NEVER a problem with previous OS X? Keeping USB devices disconnected is not the solution.

If you can not directly type in your account password, hit one of the 4 arrow keys on your keyboard, then you should be able to type in your password.

i have the same issue with my mbp2017 and mm2, however im using the original apple usb type c to hdmi, still have the laggy prob

Good work !

Cleaning of course is always good, I do it every year (and take out the fan alltogether and clean the filter after it).

Fan noise came back yesterday and I can't get rid of it this time 😢 Will find or start a new topic on this if I can.

post a link to the thread here

You are not the only one. So annoying.

try, rebooted, nothing changed

There must be memory leaking issue in the system. The OS X is not as stable as it used to be. Thanks to the incompetent CEO.

Maybe Solved...

Am running Private Internet Access (PIA) VPN and it began to act up this morning. Also noticed that when using Enpass, my password manager, I'd have to click several times inside that app before the mouse was recognized.

I uninstalled PIA then uninstalled Enpass. Shutdown the Mac Mini and after a minute or so, restarted it. Following a successful startup, I reinstalled Enpass and set up using iCloud backup data. Decided not to reinstall PIA at this time.

Bottom line: Mouse is no longer sticky or slow. Essentially it's back to normal. Think it might be a good idea to look at third party apps as being the root cause of some of this mouse stickiness. Hope this helps.

UPDATE:

The mouse lag issue has now completely disappeared. I changed nothing, so I'm at a loss to explain this. However, in it's place ( and this is probably a complete coincidence) the over-running fan issue has reappeared, but worse than before as it now does this every 10-20 seconds 24/7. Also had a massive problem with Time Machine backup - took over 5 hours when it normally takes 20 minutes. There is also another problem of random opening of Apps on startup. Will nee to start new threads for these 😢

Also concerned about the new security update - will this cause even more instability in the system 😕