I recently upgraded a DNN Platform 6.2.3 site, following the suggested upgrade path all the way to 9.12.0. I believe it was with 7.4.2 or 8.0.4 I noticed very slow page load time but decided to continue the upgrade path to the end to then diagnose the issue.
After a lot of investigation I confirmed it is due to the DDR menu provider, and if I removed the skin object (both the register tag <%@ Register TagPrefix="dnn" TagName="MENU" Src="~/DesktopModules/DDRMenu/Menu.ascx" %> at the top and calling it down in the skin) the page load time returned to essentially instantaneous.
There are only less then a hundred pages total in the single portal site, and querying the tabs tables and related stored procedures all return very quickly, and nothing is found in the DNN event logs or the /portals/_default/logs.
Any ideas where else to look at what could be causing it?
Here's the PrefView analyzer output showing the DDR menu as the culprit:
It's definitely annoying when you fix something and don't know how you did it. :)
Regarding the upgrade getting restarted from the beginning, this is definitely something that may have been the real fix. Coming up from a version that old, it's SUPER easy to miss or otherwise make a mistake at some point in the process. That, and being sure to unblock zip files you've downloaded for the upgrade.
I've given a pretty comprehensive upgrade talk a handful of times in the past. Here are some links to help you out!
Justin, thank you for sharing the full details of how you got the website from a DNN old version to the latest! Great summarize
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