Question Slow execution of open, search and reply after move to 5.1.12.1

I have been a long term user of Kunena and found it to be a very reliable and key part of my site, angloboerwar.com.

I recently updated to J3.9.8 and K5.1.12.1. All my extensions that use the Joomla update are up to date.

Since the upgrade, Kunena is a lot slower in key areas. Navigating the forum is as fast as usual but I am seeing delays when opening, searching, replying or cancelling. It is taking 18 seconds to register a 'thank you'. It is taking 15 - 20 seconds to open a thread. The steps of clicking on reply and then clicking cancel will take 30 seconds to complete. If I open a different thread and then go back to the first one within a few seconds it will take 15 seconds again. I have tried different cache setting and currently use conservative. All the functions of the forum work but now take a long time to complete.

This is not a wider issue as the performance of the non-Kunena parts of my site is normal. It is not a loading issue as it happens with one or two people on the forum. I have 60k messages in the forum.
Kunena diagnostics does not report any issues.

I have disabled UddeIM without any affect.

I am seeking help with where to look next for the source of this problem.

With thanks
David

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Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
804	Forum	kunenamenu	view=home&defaultmenu=804	forum	No
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806	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
807	Unread	kunenamenu	view=topics&layout=unread	forum/unread	No
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810	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
811	Profile	kunenamenu	view=user	forum/profile	No
812	Help	kunenamenu	view=misc	forum/help	No
813	Search	kunenamenu	view=search	forum/search	No

Joomla default template details : protostar | author: Kyle Ledbetter | version: 1.0 | creationdate: 4/30/2012

Kunena default template details : Blue Eagle5 | author: Kunena Team | version: 1.5.2 | creationdate: 2018-12-11

Kunena template params:

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Kunena version detailed: Kunena 5.1.12.1 | 2019-04-22 [ Kerberos ]
| Kunena detailed configuration:

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| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)

Third-party components: UddeIM 3.9

Third-party SEF components: None

Plugins: Search - Kunena Search 5.1.1

Modules: Kunena Latest 5.1.1 | Kunena Stats 5.1.1 | Kunena Search 5.1.1

The problem occurs when a topic contains pictures. All functions become slow when an image has to be loaded. An user had already this problem and solved this with a server setting. Unfortunately, he did not tell us what setting it was.
The other pages are fast because are not contains big images. I saw you've changed the template, but it will not help. You have a very long idle time for loading the images, thats the problem.

Addition: I see this error on your page.
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgContentMultithumb has a deprecated constructor in /.../plugins/content/multithumb/multithumb.php on line 20
Pleasse disable this plugin and try it again.

Thank you for your reply.

I have been doing more testing today with different cache setting, different templates, turning on/off other modules without any change.

As you say, the time to load is dependent on the images on the page. If there are no images, load time is good:

Time to create page: 0.307 seconds

I have a thread with multiple images and the results for this page are:

Time to create page: 40.744 seconds

The problem does not depend on how many images there are in the thread, only on how many are being display on the screen when the thread loads. For example, a thread containing 303 posts but with only 3 text posts that load when the thread loads, open in 0.4 seconds.

Turning the Kunena cache on or off makes no difference. This is the case if the cache as set to 3 minutes and the same thread is loaded and then reloaded immediately. In both cases the time to load is 40 seconds.

This problem was not evident before this version of Kunena so is it possible to identify what change is causing it please?

I presume I cannot revert to the previous version?

It is possible to ask the user what action was taken to prevent it?

My forum uses a lot of images and I am seeing usage of my site drop off these last 2 weeks probably caused by a degree of frustration on the load times. Presumably many Kunena users are affected by this issue in the latest version? A solution would be much appreciated.

With thanks
David

I did turn off Multithumb and retested once I cleared the cache. The slow loading was still evident.

Presumably many Kunena users are affected by this issue in the latest version?

Altogether this problem has been reported three or four times. But it was before this Kunena version and the last question about this problem was this topic in German language here (1 year ago). www.kunena.org/forum/36-German/150018-dr...r-eingebunden-werden
Which worked version you had installed previously?

What happens, if you set in the Joomla Global Configuration -> tab Server > "Error Reporting = Maximum" and in the Kunena Configuration (tab General) "Enable Debug Mode = Yes" ? Maybe you can see the error.