Hi @Xenareee, thanks for taking the time to report this and welcome to Wikimedia Phabricator. For future reference, please use the bug report form (linked from the top of the task creation page) to create a bug report. Please also provide version information for MediaWiki and the extension. Thanks.

In T298708#7602188, @RhinosF1 wrote:

Hi, @Aklapper: I'm going to stall this for the moment. We are currently as advertised via Sitenotice experiencing slowness due to our infrastructure migrations.

We can reopen this if it's still happening after we switch to the new DC (late next week or early the week after).

I posted it here instead of the Miraheze Phabricator because it was extension related, but thanks for the heads up. Wasn't sure if it's related to the overall slowness.

Thanks for the fast response! Hopefully that's just the slowness and no issues with the extension then ^^

@RhinosF1: Did the DC switch happen, and what was the outcome?

Yes, @Xenareee: are you still seeing this?

In T298708#7685458, @RhinosF1 wrote:

Yes, @Xenareee: are you still seeing this?

Yes, the issue is still present, despite the normal wikitext editor performance increasing greatly after the migration.

That "form edit" link no longer works (it gives a 502 error) - how can I see the problem?

I assume that's part of the issue

In T298708#7698835, @Yaron_Koren wrote:

That "form edit" link no longer works (it gives a 502 error) - how can I see the problem?

If it's throwing an error after around a minute of loading, it's a part of the performance issue. Reloading a few times allowed me to enter the edit mode when I last tried, it's most likely having problems loading the form edit mode itself as well.

Okay, now I understand the problem. I'm not totally surprised that the form isn't working - this is a 3000-line file! And if anything, that understates the size of it, because some lines contain more than one template parameter. It basically comes out to something like a 25 x 150 table of data, all contained on one page. It seems to me that you've basically run into a limitation of the software. I would strongly recommend splitting up this data - so that each call to the "DragonData" template is on a separate page.

In T298708#7700750, @Yaron_Koren wrote:

Okay, now I understand the problem. I'm not totally surprised that the form isn't working - this is a 3000-line file! And if anything, that understates the size of it, because some lines contain more than one template parameter. It basically comes out to something like a 25 x 150 table of data, all contained on one page. It seems to me that you've basically run into a limitation of the software. I would strongly recommend splitting up this data - so that each call to the "DragonData" template is on a separate page.

Alright, so it's actually expected behavior. Good to know!

We managed to handle this huge amount of data earlier in a different way, on one page that can be called faster, which we will just edit in the wikitext editor considering how long it is. Seems like PageForms are the wrong way to handle this kind of pages haha ^^

(You can close this task then if it's just the limitation of the software)