Site loads so slow on computer [Firefox bug, maybe?

[TheDemonLord12]

Covers for Manga load slow and the updates page takes so slow

 

[UnnamedPlayer]

Same for me, some pages take time to just even start loading. It's hard to describe, but i have a white page for a second or more, and then the page start loading. And sometimes, the page don't load at all.

 

[wodniobojca188]

Same, both uploading covers, and marking/unmarking chapters as read, are slow. At least 10 minute wait.

 

[Dmil666]

Ditto here.

 

[Valle_reading_manga]

I'm having trouble uploading covers as well. It seems to be unable to upload more than 12 covers at once...

 

[77BLc9JwJGpLVARkamJx]

Same here, mainly in the latest update page in the last 2 days.

 

[SoraKagami]

Chipping in: I also experienced the same issue with pages loading slow or very slow.

I think it started within the last 2-3 days? and appears to only affects desktop Firefox browsers. Or at least in my test case this was the only one that had the loading/speed issue.

More info:

• IP/GeoLocation: Tried loading pages using both Southern California (USA) and Taiwan (Asia) IP addresses (VPN)
• Browser: Desktop Firefox v131.0.3, logged in (slow)
• Browser: Desktop Chrome v122.0.6261.95, NOT logged in, appears normal?
• Browser: Brave v1.68.134, NOT logged in, appears normal?
• Mobile browser: Safari, iOS 18.1, no problems with speed, all pages loaded fast.
• DNS via 1.1.1.1 routed through a locally hosted Pi-Hole, does not appear to affect page load speeds.
• Changing the Firefox browser agent does not appear to fix the slow load issues, tested on the desktop Firefox. For this firefox instance, used a plugin to change the user-agent header to (Windows) Chrome v128, iOS 17 Safari, no difference, still slow on first load.
• (Desktop Firefox) Pages for manga info with the chapter lists load slow during the first load/access. Subsequent reloads are fast/normal.
• Pages with actual manga chapters load fine, or at least no observable slowdown.
• Manga search, especially with filters can become very slow (tho it was slow to begin with after around page 10 of complex queries).
• All desktop browsers running in sandboxie sandboxes.
• All desktop browsers above are set to auto-delete most changes/data except for cookies, history and bookmarks via Sandboxie settings.
• Browser Plugins: Only the Desktop Firefox listed above had extensions installed, specifically: NoScript (allowed MangaDex & gstatic.com), "uBlock Origin", "User-Agent Switcher", "Foxy Gestures" & "Open Tabs Next to Current".

All browsers tested above have page prefetch disabled.
Maybe I should test the Firefox without being logged in, will update later if I do.

If any of the Mangadex devs would like help testing from my end, feel free to contact me and I'll be happy to help.

 

[SoraKagami]

<Deleted, original post didn't actually fix the problem>

 

[SoraKagami]

Chipping in: I also experienced the same issue with pages loading slow or very slow.

I think it started within the last 2-3 days? and appears to only affects desktop Firefox browsers. Or at least in my test case this was the only one that had the loading/speed issue.

More info:

• IP/GeoLocation: Tried loading pages using both Southern California (USA) and Taiwan (Asia) IP addresses (VPN)
• Browser: Desktop Firefox v131.0.3, logged in (slow)
• Browser: Desktop Chrome v122.0.6261.95, NOT logged in, appears normal?
• Browser: Brave v1.68.134, NOT logged in, appears normal?
• Mobile browser: Safari, iOS 18.1, no problems with speed, all pages loaded fast.
• DNS via 1.1.1.1 routed through a locally hosted Pi-Hole, does not appear to affect page load speeds.
• Changing the Firefox browser agent does not appear to fix the slow load issues, tested on the desktop Firefox. For this firefox instance, used a plugin to change the user-agent header to (Windows) Chrome v128, iOS 17 Safari, no difference, still slow on first load.
• (Desktop Firefox) Pages for manga info with the chapter lists load slow during the first load/access. Subsequent reloads are fast/normal.
• Pages with actual manga chapters load fine, or at least no observable slowdown.
• Manga search, especially with filters can become very slow (tho it was slow to begin with after around page 10 of complex queries).
• All desktop browsers running in sandboxie sandboxes.
• All desktop browsers above are set to auto-delete most changes/data except for cookies, history and bookmarks via Sandboxie settings.
• Browser Plugins: Only the Desktop Firefox listed above had extensions installed, specifically: NoScript (allowed MangaDex & gstatic.com), "uBlock Origin", "User-Agent Switcher", "Foxy Gestures" & "Open Tabs Next to Current".

All browsers tested above have page prefetch disabled.
Maybe I should test the Firefox without being logged in, will update later if I do.

If any of the Mangadex devs would like help testing from my end, feel free to contact me and I'll be happy to help.

Chrome logged in was still fast (same as logged out).
Firefox logged in after fully clearing FF (+ sandbox) is still slow.
Firefox logged out appeared "ok", slightly slower than chrome.

Update:
Issue still remained after disabling all prefetch options in Firefox, including one I missed in earlier testing. Sometimes everything loads fast, then after a while the problem starts re-appearing (slowness for pages with info, update/MDLists may load icons slow etc.).
At this point I'm just going to chalk it up to either (bad) luck with Firefox, or some Firefox incompatibility. Already spent more than two hours testing, posting, then deleting test info & results after finding out that the results differed in a later re-test.

Perhaps I'll try moving to Chrome or Brave for Mangadex and see how that goes.

Update 2:
No slowdown on Brave, still sporadically slow on Firefox. Both have my account logged in, sequentially loaded the same page and Firefox still exhibits the slowness at times (Firefox then Brave). Also tried loading the same page(s) the other way round (Brave then Firefox), same behavior.
At this point it looks more like a Firefox (v131.0.3) specific incompatibility with Mangadex?

 

[UnnamedPlayer]

Chrome logged in was still fast (same as logged out).
Firefox logged in after fully clearing FF (+ sandbox) is still slow.
Firefox logged out appeared "ok", slightly slower than chrome.

Update:
Issue still remained after disabling all prefetch options in Firefox, including one I missed in earlier testing. Sometimes everything loads fast, then after a while the problem starts re-appearing (slowness for pages with info, update/MDLists may load icons slow etc.).
At this point I'm just going to chalk it up to either (bad) luck with Firefox, or some Firefox incompatibility. Already spent more than two hours testing, posting, then deleting test info & results after finding out that the results differed in a later re-test.

Perhaps I'll try moving to Chrome or Brave for Mangadex and see how that goes.

Update 2:
No slowdown on Brave, still sporadically slow on Firefox. Both have my account logged in, sequentially loaded the same page and Firefox still exhibits the slowness at times (Firefox then Brave). Also tried loading the same page(s) the other way round (Brave then Firefox), same behavior.
At this point it looks more like a Firefox (v131.0.3) specific incompatibility with Mangadex?

To complete and confirm your answer, the issue also appear on a more recent version of firefox (the last one, 132.0.2), with only µblock (disabled on mangadex), prefetch disabled manually in about:config. And the issue also impact chapter loading, it appaear randomly as you have see yourself. Looks like it's a firefox issue.

Also, when page fail to load, in the FF dev tools, i have some GET request fails with the error code NS BINDING ABORTED.

 

[Samhill]

Slow for me here too. Under the updates section, the cover images load slow. Under the chapters themselves the pages load slow as well.

Before all of this the.... carousel (?) on the front page was loading slow for a while for me as well.

After some slow loading at the start, all goes smoothly after that.

 

[Roler]

Ok, this has been happening to me lately too and I've tested it on multiple Firefox versions (all clean installs, default settings, DOH disabled), from 128 to 132, all versions caused the issue.

Chrome is also sometimes slower and takes seconds to respond, but still much faster than Firefox.

This is the issue in Firefox:



A single request takes several seconds after the site makes several other requests to the API, but I'm unsure what "Blocked" exactly means here. Also, it appears the more requests the site makes prior to that the longer the "Blocked" status is (some requests above this one also had the "Blocked" status but for a much shorter period)

I have also tested in Chrome, and while it also gets "throttled" in Chrome, it's for much shorter periods (sometimes it did take a bit more):

 

[Roler]

https://firefox-source-docs.mozilla...tor/request_details/index.html#request-timing

Name	Description
Blocked	Time spent in a queue waiting for a network connection. The browser imposes a limit on the number of simultaneous connections that can be made to a single server. In Firefox this defaults to 6, but can be changed using the network.http.max-persistent-connections-per-server preference. If all connections are in use, the browser can’t download more resources until a connection is released.

Unfortunately, increasing network.http.max-persistent-connections-per-server to 255 didn't help for me, but you can still try.

 

[Trobilobada]

I briefly mentioned it in the contribs channel last week, search requests sometimes taking more than 20 seconds to resolve, but no one batted an eye so I thought it was a my-machine issue.

 

[Manko-sensei]

I'm not in any Discord server so I'm out of touch but yes, I've been for the same time experiencing those delays when loading even the forum, except when I open in bulk several windows if I simply want to see a single item or two I refresh until I see it loads, it's normally faster that way. Patiently waiting for the issue to solve itself.

 

[SurfboardSamurai]

Oh, good, so it's not just me. I've been experiencing this with Firefox this week, too, and part of me was worried that I'd somehow managed to download some malware that was affecting my connection (though I was left confused by the fact that the site ran faster on Edge when I tried it).

I'd rather not have to use another browser other than Firefox, so I guess I'll just sit tight and see if the next update fixes things, though I'd also like to note that I've been having trouble with one of my extensions this week, too, and at this point, I'm just going to assume it's related to the Firefox update (and possibly whatever caused this issue with MangaDex).

 

[coldasice]

Im getting ns_binding_aborted error and very slow loading in firefox, started happening a few days ago. which slows down everything for me sometimes not even loading chapter (just says "no pages" | to be honest i just refresh so im not sure if it will load pages after some time. Since i want to read manga ). And sometimes stop loading random title images when loading in follows updates

 

[kouyo]

Hello, we are aware of this issue. Our devs are looking for a fix.

 

[_kojika_]

The pages seem to be loading a lot faster since the site update earlier today.

 

[Samhill]

Hello, we are aware of this issue. Our devs are looking for a fix.

Could you ELI5 the problem?