The site is also much slower to load on mobile than previously.
This isnât caching, as I am seeing this per link folllowed.
Loading this page made about 60 requests and transferred a total of 1.3 MB for me. With or without cache doesnât seem to matter. The biggest transferred chunks is (oh wonder) the javascript application itself.
It seems to be that this is something that should be cached / be cachable? Even the downloaded images (OSM logo etc) are not cached.
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Paying attention to bandwidth needs is a critical thing to do, now and going forward. It very likely can be better managed, perhaps starting with an urgent feature request ticket. Smarter caching can be a âquick tune-upâ amount of effort (not much) and itâs 99% or 100% done (for now).
As far as @SK53 's refreshing notifications, I donât doubt it! Not just flushing of old caches, but downloading of both code to run things and data which donât appear to be well-cached. That really should be tuned up.
I, too, have noticed significant differences (sidebar included) with Safari (browser) on macOS, but Iâll reserve further comment for now. Iâm on a fast, all-I-can-drink network, so I donât see / pay attention to download, speed or caching / buffering issues (directly), though I can do some âtraffic analysis across the wiresâ if need be.
Iâm glad to see people talking about things like âperformance and network bandwidth on mobile devicesâ as that is truly critical for Discourse 3 (and beyond) to work (in a global project, on a billions-of-mobile-devices planet).
Iâve heard it said before (about software âtuningâ): âthis is manageable.â We talk about it a bit (like this), the right people are tapped on the shoulder with a small list of possible tune-ups and âthings improve.â
It should be said at least once (again?) that âan initial downloadâ is simply going to be a bandwidth hit. So for quite a few (including those who are only just now reading this using 3.0) they might have experienced the worst of it, and it might be better, or sluggish ahead, thatâs still yet to be determined.
So, eyes open, everyone. If you see something, say something. We can turn off that spigot as needed.
Steady ahead as she goes, Captain. (Captains, maybe).
Caching is done automatically by the browser unless it is prevented for one reason or another. However, I donât understand why it doesnât seem to be cached. Maybe a web developer can chime in here?
- The url of the resources do not change (e.g. the url of the main application script was https://community-cdn.openstreetmap.org/brotli_asset/discourse-dd32ad61cf639ec4d0b60cabb7b09ec6cd22e175bd8d0f7bf96d630634504baf.js both in the first page load and a subsequent page load
- the cache response headers seem to be in order (see picture below): max age of 1 year
- not sure what âservice workerâ in the âTransferredâ column means. Usually it should say how many bytes were transferred or âcachedâ if that resource is cached. Anyone know what this means?
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Maybe you accidentally activated âDeactivate Cacheâ in DevTools? For me Caching works, only about 700kb are transferred
Okay, nevermind. I found the documentation for the Transferred column - in a nutshell âservice workerâ means that the caching is handled by a service worker and that no bytes were transferred. The developer tools in Edge are clearer in that it also displays the bytes transferred
In conclusion, it doesnât seem to be a caching issue at all. What is always transferred without cache is the html page itself, but this page for example is just 40kB.
No, I have not activated that option. Curious:
- your Firefox shows only 729kB were transferred
- my Firefox shows 1480kB were transferred
- my Edge shows only 42kB were transferred
What page were you testing on? I just used this topic page. Maybe there were differences in how much new content was there at reload time?
But I wouldnât worry too much about it, 500kb to 1.5 MB transfer size are really not much compared to most other websites.
I measured the amount of data actually received by my computer. Using Firefox.
First load: 1,77 MB
Second load: 32 kB
So the caching works fine. 
Moving the performance conversation to a new topic for better tracking.
@Firefishy bringing this to your attention 
Depending on where you are, that might be the case. In some places that might be enough to make using this site financially impossible.
Separately from that I find that even on a fast mobile broadband connection (31Mbps down) it takes about 5 seconds to load the first page, and 4-5 seconds to load subsequent ones**, following a link from an email. A snappy conversation it is not - if any of the systems I used to work on back in the 80s were that slow on every page load theyâd have been thrown out.
** Firefox, Nokia 6.1, Android 10. On a newer phone (Nokia X10, Android 13) itâs about 3 and 2 seconds respectively. better; but still not great.
While I sympathise with anyone having issues with the caching / download size issues with the website, we are running a fairly standard install of discourse. Any issue will likely need to be fixed upstream.
Modern browsers use the brotli compressed assets. Older browsers use gzip compressed assets. Make sure to use network transferred bytes, rather than uncompressed asset size when using web developer tools.
I have briefly tested using the latest Chrome and Firefox, after an initial large set of JS/CSS etc downloads, the subsequent pages load using less than 100KB of new downloads.
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I canât reproduce that though. It takes about 1 second on an Android 11, Firefox, with 1 of 4 bars of 4G connectivity. Which is plausible given that on reload, something like 40kB or so are actually transmitted.
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