I’d have a look at Activity Monitor to see if there is a process running that 
is maybe slowing things down. If this doesn’t show up anything peculiar then 
maybe a clean instal of macOS?

It is years since I’ve seen a problem with Preview which is my go to for 
viewing PDFs, markup, rearranging pages, merging PDFs, etc. Thoroughly reliable.

Regards,

Tony
Sent from my iPad

> On 19 Nov 2018, at 11:44, Graham Street <[email protected]> 
> wrote:
> 
> For large PDFs I do this, but smaller ones are usually fine with quick look 
> until the ‘beach ball’ thing starts with any quick look or preview of any 
> file. It doesn’t seem to be one specific thing that triggers it starting to 
> happen.
> 
> Graham
> 
>> On Monday, 19 November 2018 at 11:32, Derek Cross wrote:
>> 
>> It’s much better too view PDFs on the Acrobat Reader rather than Mac Preview.
>> Derek
>> 
>>> On 19 Nov 2018, at 11:07, Graham Street <[email protected]> 
>>> wrote:
>>> 
>>> Anyone seen or have a solution for this ... ?
>>> 
>>> After several (not measured how many) days of doing similar previews, I try 
>>> a macOS preview to do a 'quick look' at something like a JPG or PDF and I 
>>> get the spinning beach ball and a 'pause' of what feels like a minute. And 
>>> then the preview appears. It seems to happen on quick look and also if 
>>> opening a folder where it wants to do a preview of a file I'm highlighting. 
>>> The same happens in the Applications folder if clicking on an App and macOS 
>>> is wanting to show the app's preview icon in the finder window. I did a 
>>> Malwarebytes scan just in case.
>>> 
>>> Eventually I can't live with it and do a restart. Then it all works fine 
>>> again, until the next time. I have loads of free memory and around 33% free 
>>> disk space. I've googled for solutions and tried one (deleting the folder 
>>> ~Library/Containers/com.apple.Preview) but that didn't fix it unless the 
>>> restart afterwards was necessary too. I'm currently in the period where its 
>>> all working fine so can't yet reproduce anything or check on possible fixes.
>>> 
>>> Thought I'd ask the group if anyone else had come across this. No doubt an 
>>> upgrade to macOS (to High Sierra or Mojave) might fix it but I'm not at a 
>>> convenient point to do this currently.
>>> 
>>> Graham
>>> 
>>> 
>>> 
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