Autocad slows down for all users at the same time

We have a client that has a mixture of Autocad versions 2011 - 2016
For some reason at random times everyone's Autocad slows down (ie panning and zooming or editing)
Access to the file server is not slowing down, but the program itself gets very laggy.
All the users are using different files.
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MultiTrendsAsked:
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Nick RhodeIT DirectorCommented:
Wouldn't by chance have something scanning at the time?  Like an Antivirus or the vault where the drawings are stored starts indexing etc?  Also look at your raid storage and see if there is any latency in the read/write.

Depends on if its narrowed down to a certain time or randomly happens?
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MultiTrendsAuthor Commented:
Currently it seems to happen randomly.
Note that file access speed is not affected.
Just working in Autocad everything slows down, there is no read / write operations taking place.
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Gerald ConnollyCommented:
So there must be a resource issue of some kind, at the point things slow down!
 - CPU?
 - RAM?
 - Network throughout?
 - Disk throughput (MB/s)?
 - Disk Bandwidth (IOPS)?
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MultiTrendsAuthor Commented:
Have not seen any resource slow down on the server.
And I doubt that all the PC's 15-20 of them all have resource issues on Autocad only at the same time.
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Gerald ConnollyCommented:
Multi trends, if all the clients slowdown at the same time it's obviously an issue with a common resource!
So the network and the server must be the obvious suspects.
Checking the server resource usage is easy, look at disk throughput (MB/s) AND bandwidth (IOPS) and the disk queue length
What about the network can you monitor what's going on there? Is it as simple as somebody downloading a large file from the Internet, or are you using an external cloud?
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Gerald ConnollyCommented:
Clear pointers to ways to check causation given
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