Deleting Assets takes a very long time

Deleting Assets takes a very long time

Hi All,
 
Not sure if this is a problem as such so I figured i'd post this as a question as its not something that's completely broken or affects us in any bad way. I noticed that now if we try to delete 50 assets or more at once, it can take up to an hour to delete these assets, so long as the browser window doesn't time out.
 
Deleting 5 assets or less takes less than a minute.
 
We usually run a clean up and re-scan of all assets every few months. We're currently on SD 9021 and noticed this behaviour since we upgraded from version 8.
 
We have also archived historical requests thinking that may be causing the issue but that hasn't helped.
 
Is there anything we can check out to see if this is a problem?

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