Opening a ticket is slow for first access

[Dave Merrill]

We've recently started experiencing quite slow performance in our on-premises Jira install, specifically:

• List (queue) display is fast
• The first time I view a particular ticket, it's taking ~15-20 seconds to open, but if I go back to the list and open the same ticket again, it's quick
• Tried 3 different tickets, and all 3 were still quick to reopen after viewing the others
• Opening a 4th ticket ticket was still slow the first time, then fast to reopen

Both the Jira app server and its associated MSSQL db server appear to have plenty of CPU and RAM headroom.

Any ideas for directions to explore?

[Pritam Kumar]

@Dave Merrill : Welcome to the community.

It seems more like a network issue. When you open issue for the first time, the browser retrieves all the data(images, javascript, icons etc) from the server and keeps it in the cache. This is taking a lot of time.For later requests, the browser retrieves common files from the cache and the load time speeds up. 

To verify, try disabling the cache of the browser from developer tools(See attached image) and open the issues.

If the time delays remain constant( ~15-20 seconds to open) for successive requests, it's a network issue. You need to check your network configuration to identify the cause of the delays.
If the time delays are similar to the one described in your question, you need to check for server performance issues.