Super slow startup and other problems

1. Reset PRAM:  Reset NVRAM or PRAM on your Mac - Apple Support

     Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, 

     and recent kernel panic information. 

     The settings stored in NVRAM  depend on your Mac and the devices that you're using with your Mac.

2. Reset  SMC:   How to reset the SMC of your Mac - Apple Support   Choose the appropriate method.

    Quote:

    Resetting the system management controller (SMC) can resolve certain issues related to power, battery, fans,

    and other features.

3. Startup in Safe mode. https://support.apple.com/en-gb/HT201262 Choose the appropriate method.

    To leave Safe Mode, choose “Restart” at the bottom.

    Quote:

     Safe mode prevents your Mac from loading certain software when it starts up, including login items, 

     system extensions not required by macOS,

     and fonts not installed by macOS. It  also does a basic check of your startup disk, 

     similar to using First Aid in Disk Utility. 

     And it deletes some system caches, including font caches and the kernel cache, 

     which will be created again automatically as needed.

4. If you find your Mac is running slowly, there are a number of potential causes that you can check.

https://support.apple.com/guide/mac-help/if-your-mac-runs-slowly-mchlp1731/mac

Versyficator Said:

"Super slow startup and other problems: Hi Experts! My Macbook Pro suddenly is startning VERY slow (sometimes hangs) and apps are starting up slow (or not starting) too.: I know its getting old but I thought a restore or factory reset might fix things for a while until I upgrade to a new device.[...]"

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Maybe Upgrade:

All computers are bound to go dead over time - that's without a doubt. So, maybe you should take this as a good reason to upgrade to a new computer. A Factory Reset, indeed, seems the way to go. But, that would be a last resort.

Versyficator Said:

"Super slow startup and other problems: Thanks. I suppose I'm at the last resort phase. And I guess I'm ready to upgrade. Cheers"

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You are welcome.

Indeed, this is a reason why I upgraded to a new Mac.