opentype

Probably not, since there was still no causal connection shown between sitemap creating speed (the actual topic here) and decrease in indexing/ranking. So there is probably nothing to fix. 
 
That might be, but IPS didn’t as well. Google changed things and you can check wether their algorithm updates (e.g. Fred in 2017) correlate with your problems. That would actually tell you more about what you could probably improve. 

Just so you know, we're watching this topic and looking at our own stats to build a better picture.
The facts we know:
1) Almost every site I've got access to (via friends, etc) have seen a massive drop since June of indexed pages. This is not exclusive to Invision Community powered sites. I've seen the same with Wordpress.
2) Google slipped in an update in 2017 to target several things, one of these things is poor backlinks and other poor quality links. It looks like this means that user profiles that have no content have been dropped from the index along with links that 301. That is fine. You don't want Google storing the 301 link, as long as it stores the real link (and it does seem to).
3) A drop in what is indexed doesn't actually correlate to the health of the site. We've seen our index volume drop, but clicks, engagement and discovery slightly increase (probably due to better quality results?)
As always, Google say nothing so we're left guessing.
We will look at stopping user profiles from being submitted. For example, we see nearly 380k links as 'discovered' but Google has chosen to not index them. Looking through the list, it's all user profiles.
This means:
1) Sitemaps are working fine. There's no massive problem with them that correlates with a drop in indexed pages
2) The cornerstones of good SEO are taken care of in the software
3) Google is being weird and mysterious as always.
What can we do in the short term?
1) Stop sending profiles with no content to the sitemap. They are now ignored and Google appears to be dropping them from its indexes
2) Add in nofollow on links that 301 so Google doesn't bother 'discovering' them at all.

It's really nothing special to look at like myself, but it's https://dcfcfans.uk . We've been online 9 years yesterday. I've not looked but would imagine our backlink profile is strong through natural sharing, never went in for all those link exchange things.
When visiting though please disable your ad blockers unlike Lindy  

So many misconceptions.
If @daveoh were to share his site, you would see it's very clean, well organized, has high quality content and a glance shows his backlink profile is strong. He also has little to no apparent ads.
@Nesa while I understand your concerns and understand your frustration, the sitemap itself is not the cause of your issues. This was posted earlier today and was already indexed by Google hours ago. I've checked some of our larger enterprise sites and their content from today is also being indexed in a timely fashion. I just searched the topic you referenced and it too is listed. There's no magic bullet in 4.3 or even other software that's going to put you on the front page of Google or instantaneously push new content directly to Google.
The big algorithm update of 2017 targeted a lot of sites with some losing as much as 90% of their traffic. Some of these sites flew under the radar with what Google considers low quality content and in Google's eyes, they were righting the scale. There are many factors that influence your position in Google, your index rate and frankly, whether or not Google just likes or hates you.
Ads
If your site has ads that detract from the user experience and content on your site, Google WILL penalize you and that was the single most biggest hit in the "Fred" update. An ad in the header and footer are ok. An affiliate link or "sponsored content" that is appropriately placed and blends with content is ok. Ads all over the page and in the sidebar are obnoxious to users and Google agrees and doesn't want to subject us to it (for which I'm, as a user, appreciative.)
Backlinks
Backlinks can account for up to 1/3 of your overall standing with Google -- that is, quality backlinks; not "hey, link to me and I'll link you back."
Content Freshness/Quality
You may very well have 15 million posts, but if they're all from 2003 and you get very little new content, your old content is going to have less value to Google and they may drop it. Keep it fresh, keep users engaged.
Google has gotten very intelligent and can distinguish rehashing the same musings over fresh information. General discussion sites with loose/generic content won't likely fare as well as those with unique, relevant content. Pages with thin content (such as picture threads, a bunch of "lols", etc.) are likely to get hit by Google.
 
Again, Google cleaned house in 2017 - many sites got hit, including those using Wordpress, vB, etc. There's just too many variables to get all up in arms over one component: a sitemap. A sitemap, even the complete absence of a sitemap is not going to cause your indexed pages to drop. If this has happened to you, it's because Google penalized you and dropped your content. A sitemap is also not a magic wand and Google will not consider it the be-all for indexed content. A sitemap is a good gap filler and provides Google additional insight, but most content is still indexed organically through links.
4.3 will provide for the mentioned improvements to the sitemap. Given 4.3 is so close, I'm sorry, but it would not be worth re-engineering those improvements for 4.2 and again, it's not going to be the magic solution you believe it to be. Unfortunately, I can only suggest focusing on the above list as one or more of those items is the likely culprit for your site being dropped.

Love all the templates that you have created. They are throughout my site.
I would like to ask for a couple new features.
1. Another template set for the Blogs and possibly Gallery.
2. Ability to replace one of the squares in the grid with an ad. Choices that are already there or a custom ad tag.

There are no size settings. The cards take as much space as they need within the grid. The image size is defined in the plugin settings (“aspect ratio”). 

If it’s a channel feed you can subscribe to the channel. If it’s a playlist, it can contain videos of many different channels. So what are you actually subscribing to? That might be confusing. 

SuperGrid, like many block templates is checking the $orientation value. So if there is a problem, it probably has something to do with that. 

Yes. 
SuperGrid is just styling for Pages databases. But your server chokes on any page, e.g. loading the calendar. My product has nothing to do with that. It can’t be the problem. 

I wouldn’t know how this could be related to my products, since it is happening for every page. 

I plan to do something about for 4.3. 

I plan to do something about for 4.3. 

If anyone had problems with disappearing plugin settings from this product or any other, please: 
Upgrade to 4.2.7 Uninstall the plugin Reinstall the plugin Save your new plugin settings The settings should then be stored permanently. 

FEEDBACK:
 
- Please let us SHOW / HIDE the title bar at the top of the module
- Please let us SHOW / HIDE the title of the embedded video under the embed
 

I am also not sure what ProSkill is asking about for example. The original post is about the speed of generating sitemaps for large sites, ProSkill talks about “decrease in cached URLs”. Not sure what that is and how it relates to sitemap generation. 

I am also not sure what ProSkill is asking about for example. The original post is about the speed of generating sitemaps for large sites, ProSkill talks about “decrease in cached URLs”. Not sure what that is and how it relates to sitemap generation. 

It’s a block like any other. You just drag the database widget from the sidebar manager and pick the database. 
Nope. Combining the page templates and the block should work fine in general. Done that myself many times. 

Doesn’t matter actually. SuperList is a block template. For a typical use of SuperList you wouldn’t even expose the database page to your users and just use a block. So the database templates (front page/category/listing/record) aren’t relevant. If you do use them, you can show them however you like. It’s unrelated to SuperList. 

Interesting!
I just activated it, but it seems to ignore social media signups. Is that intentional?

I desperately need this functionality to optimise use of clubs.

I want to be able to automatically grab news and post it directly to clubs!

Please add this in soon! (Or inform me of an add-on that makes it work!)

It just takes static links at the moment. 

Support topic for this plugin: 
 

Support topic for this plugin: 
 

Makes sense. I can do that when I upgrade the templates for 4.3. 

I would suggest to add support for 3rd party plugin category images also in supergrid ..

Thank you !