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Here’s a quick and easy tip: when someone reports the ALUI Portal is “slow”, have them do a View:Source on the page and scroll to the bottom. There they should see an HTML comment on how long it took for the page to render:

Not only can you see what server the page was loaded from (in the event that there are multiple servers behind a load balancer) and the portal version, you can see how long it took for the portal to put the page together and respond to the request (in milliseconds). If the number is low (less than 2 or 3 seconds), then the slowdown is likely the network or any of the devices in front of the portal (like the load balancer itself). If, on the other hand, it’s pretty high (over 5 seconds), you can probably rule out the network as the primary cause of the slowdown, and start focusing on the portal and portlet servers.