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This is interesting.
Grafana Faro is an experiment I'm trying - it reports JavaScript errors back to me, and normally I'm blind on those so if I can start seeing them perhaps I can fix them.
But it should be 100% async and not impact page loading at all.
Do you know how to record a HAR file? https://support.zendesk.com/hc/en-us/articles/4408828867098-Generating-a-HAR-file-for-troubleshooting
Could you make a HAR file for a page that loaded slowly and send that to me (via DM or email to lfgss@david.kitchen) - do not post it in this thread as it will include your cookies including any authentication.
The HAR file will allow me to see whether network is the issue.
If it isn't network, then it's going to be something in the client such as config or an add-on. I'm on Firefox too and do not see any speed delays or loading issues.
From a very first glance, I actually think the network is fine and you're more likely to have an add-on that is delaying the page being painted / rendered rather than any delay in the server processing or the client receiving the page. The HAR file will at least confirm it's not the server or network.
Cheers, I think looking at here for instance it just seems to take ages loading all the grafana stuff (although it doesn't try until nearly 15 seconds in?, I'm not quite sure what that is telling me)?
Other pages seem to have the similar not loading anything for a while issue I think, I may be completely misinterpreting that though.