Hi Clive,

> It would appear that something is happening in start up that loops
> round and hogs memory.

What makes you say that.  Have you see an indication that memory usage
is high?  What's the output of `free -m' once it's up and running and
behaving slowly, e.g. copying pictures described above.

> How can I find out what's happening during the start up process
> please?

`journalctl -b' will show journal entries since the last boot.  You will
be in less(1) so `f' goes forward a page, `b' backwards, and `q' quits.
The lines at the start will all have `kernel:' in them as nothing else
is running.  Note the start time and page forwards until that changes to
`systemd:' showing the first process has been started.  How long is the
gap between the two?

You could continue to page forward looking to see if there's a
significant gap in time where nothing appears to happen because
everything is waiting on something, though it probably won't show
anything given your overall description.

> My wife's desktop PC running Mint 18.10 takes a very long time in
> starting approx 4-5mins, (it used to start in less than 1min).

What changed around that time?  Have a look at /var/log/apt/history.log
for packages that were upgraded just before it slowed down.  If
history.log is empty then history.1.gz, or 2..., may be the file to
inspect.

-- 
Cheers, Ralph.

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