Site performance, Server errors, outages and tunings

[Like Ra]

I noticed one interesting thing - the caching has become very effective, rather too effective. I have to refresh twice to get the pages updated. Though, I'm not sure if it's PHP 7.4 or firefox 72, or both. Has anybody else noticed a similar behaviour?

It has become pretty annoying, but I can't find the source of it. The only solution so far is to reload forum pages several times. I'm going to upgrade MyBB to the next version, let's see if it changes anything.

[Like Ra]

The forum software has been upgraded to the latest version (1.8.22). The "stale caching" issue did not go away 😟 The rest looks OK.

[Tinker D]

If you have to refresh a few times, doesn’t that mean that the refresh cycle is taking longer to Complete? And if so, the system may think that the refresh is an error and reject it. Therefore, it does not refresh, but reloads the same screen.
No changes.
Yea, it can piss you off at times.

[Like Ra]

Most likely it's something about caching. I think it started when I upgraded from PHP 7.3 to PHP 7.4.

[Like Ra]

Added the following to the header:

<meta http-equiv="Pragma" content="no-cache" />

Let's see if this helps.

[Like Ra]

I think it looks a bit better now, might require a modspeed cache clean, though... What do you see?

Update: nope, still weird issues.

[Tinker D]

Yea, weird is the word.
Are you sure the parameters are correct and not conflicting with another pug in that is not listed?
In other words, upgrade everything before upgrading. If that made any sense at all.

[Like Ra]

Yep, everything is upgraded to the latest stable version. It feels like it's on the server side, because it shows old information, even if the page was not open in this particular browser (hence "no-cache" does not work, because it affects the browser side). OTOH, refreshing the browser window 2-3 times does help. I'm really puzzled. Let's disable ModPageSpeed...

Update: no, it's not PageSpeed.

[Tinker D]

So the old information is not being updated.
Is it because the server is not getting or loading the new information before refreshing? Still think a link is missing or not configured correctly.

[Like Ra]

Interesting, it always takes 2 page refreshes. The first one will update "something", the second - the rest.

All, what do you see? Please let me know, if you see (or don't) the weird issue when the page is outdated, and mention the browser (with version).