Having at some point maintained a soft fork / patch-set for Nextcloud.. yes, there is so much performance left on the table. With a few basic patches the file manager, for example, sped up by magnitudes in terms of render speed.
The issue remains that the core itself feels like layers upon layers of encrusted code that instead of being fixed have just had another layer added ... "something fundamental wrong? Just add Redis as a dependency. Does it help? Unsure. Let's add something else. Don't like having the config in a db? Let's move some of it to ini files (or vice versa)..etc..etc." it feels like that's the cycle and it ain't pretty and I don't trust the result at all. Eventually abandoned the project.
Edit: at some point I reckon some part of the ecosystem recognised some of these issues and hence Owncloud remade a large part of the fundamentals in Golang. It remains unknown to me whether this sorted things or not. All of these projects feel like they suffer badly from "overbuild".
Edit-edit: another layer to add to the mix is that the "overbuild" situation is probably largely what allows the hosting economy around these open source solutions to thrive since Nextcloud and co. are so over-engineered and badly documented that they -require- a dedicated sys-admin team to run well.
This is my theory as well. NC has grown gradually in silos almost, every piece of it is some plugin they've imported from contributions at some point.
For example the reason there's no cohesiveness with a common websocket bus for all those ajax calls is because they all started out as a separate plugin.
NC has gone full modularity and lost performance for it. What we need is a more focused and cohesive tool for document sharing.
Honestly I think today with IaC and containers, a better approach for selfhosting is to use many tools connected by SSO instead of one monstrosity. The old Unix philosophy, do one thing but do it well.
This still needs cohesive authorization and central file sharing and access rules across apps. And some central concept of projects to move all content away from people and into the org and roles
Why do you need a common websocket bus when h2 interleaves all the HTTP requests over the same SSL tunnel?
Two things:
1. Did you open back port request with these basic patches? If you have orders of magnitude speed improvements it would be aswesome to share!
2. You definitively don't need an entire sysadmin team to run nextcloud, in my work (large organisation) there's three instances running (for different parts/purposes of which only one is run by more than one person, and I run myself both my personal instance and for a nonprofit with ~100 persons, it's really not much work after setup (and other systems are plenty of a lot more complicated systems to set up, trust me)
1. There was no point, having thought about it a bit; a lot of the patches (in essence it was at most a handful) revolved around disabling features which in turn could never have been upstreamed. An example was, as mentioned elsewhere in this comment section, the abysmal performance of the thumbnail gen feature, it never cached right, it never worked right and even when it did it would absolutely kill listings of larger folders of media - this was basically hacked out and partially replaced with much simpler gen on images alone, suddenly the file manager worked again for clients.
2. Guess that's debatable, or maybe even skill dependent (mea culpa), and also largely a question of how comfortable one is with systems that cannot be reasoned about cleanly (similar to TFA I just could not stand the bloat, it made me feel more than mildly unwell working with it). Eventually it was GDPR reqs that drove us towards the big G across multiple domains.
On another note it strikes me how the attempts at re-gen'ing folder listings online really is Sisyphus work, there should be a clean way to enfold multiuser/access-tokens into the filesystems of phones/PCs/etc. The closest pseudo example at the moment I guess is classic Google Drive but of course it would need gating and security on the OS side of things that works to a standard across multiple ecosystems (Apple, MS, Android, iPhone, Linux etc.) ... yeeeeah, better keep polishing that HTML ball of spaghetti I guess ;)