Pages keep too long to load, or render as a white page

The forums are Drupal 7. I think we usually send these to the webmasters queue. Please attach the output of the browser's console log if you can catch it happening.

I am having the same problem with this very issue queue. When Google Chrome keeps spinning, the Dev Tools show it's a missing cache on Varnish. For example, one of the failed requests had the following header.

Fastly-Debug-Digest:774b25abd89dcdd756f30023b087d803910fcabbf1bc614394e310cf9aebf464

I thought it could be Google Chrome to create problems in some way, but I tested also with Firefox Developer Edition, and I am getting the same issue.

What’s happening on the browser’s network log/timeline when this happens? What specific request(s) are hanging?

After changing DNS settings for my computer, in the past days I didn't notice any slow-down. Using Firefox I just noticed the page request keeps too much, but no error code was given from Firefox Network tool.

As for when it happens, or it's an admin view, or it's a page with a form. I noticed the slow-down when I was deleting spam messages; in that case, the confirmation form was not appearing, or the page shown after submitting the confirmation form was not appearing (i.e. the browser loading spin kept spinning).

Now that I am using Chrome again, I will try with the spam view and see if I still have problems.

I just had a problem accessing https://www.drupal.org/admin. This is the network output.

These are the response headers. (I removed the part about the cookies.)

HTTP/1.1 200 OK
Server: nginx/1.10.2
Content-Type: text/html; charset=utf-8
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Cache-Control: no-cache, must-revalidate
X-Content-Type-Options: nosniff
Content-Language: en
X-Frame-Options: SAMEORIGIN
X-UA-Compatible: IE=edge,chrome=1
Accept-Ranges: bytes
Via: 1.1 varnish
Fastly-Debug-Digest: 48d6d63aa03d8d50f56f894cc1599d5c9b471728da6a6556d5d2c8da369727bb
Accept-Ranges: bytes
Date: Sat, 03 Jun 2017 07:25:05 GMT
Via: 1.1 varnish
Connection: keep-alive
X-Served-By: cache-sea1023-SEA, cache-fra1246-FRA
X-Cache: MISS, MISS
X-Cache-Hits: 0, 0
X-Timer: S1496474704.279251,VS0,VE816
Vary: Accept-Encoding
Content-Length: 23650

Notice that I was still seeing a white screen after 5 minutes. I just clicked on the button to return here to write this comment; otherwise, I was still waiting for the page to show.

In the case it's not readable, the error shown from the console for https://www.drupal.org/admin is net::ERR_CONTENT_LENGTH_MISMATCH.

I am trying with a different Chromium-based browser (Brave), and so far, I am not having the same issue.

I am going to use this browser for the next days, so I will be able to verify it's Google Chrome that is causing me any trouble with drupal.org.

With the Brave browser, the worst I got was 16 seconds for the front page, and 8 seconds for an issue node. With this browser, I have never seen a page not loading as with Google Chrome.

The only difference I saw is that this browser blocks both https://www.google-analytics.com/analytics.js and https://js-agent.newrelic.com/nr-1026.min.js. Could that make a difference, in someway?

Notice that the problems I had with drupal.org with Chrome and Firefox were the same problems I had with api.drupal.org.

To make a comparison, these are the response headers for https://www.drupal.org/admin the Brave browser reports.

accept-ranges:bytes
accept-ranges:bytes
cache-control:no-cache, must-revalidate
content-encoding:gzip
content-language:en
content-length:8758
content-type:text/html; charset=utf-8
date:Wed, 14 Jun 2017 09:55:12 GMT
expires:Sun, 19 Nov 1978 05:00:00 GMT
fastly-debug-digest:48d6d63aa03d8d50f56f894cc1599d5c9b471728da6a6556d5d2c8da369727bb
server:nginx/1.10.2
status:200
vary:Accept-Encoding
via:1.1 varnish
via:1.1 varnish
x-cache:MISS, MISS
x-cache-hits:0, 0
x-content-type-options:nosniff
x-frame-options:SAMEORIGIN
x-served-by:cache-sea1028-SEA, cache-fra1232-FRA
x-timer:S1497434112.971727,VS0,VE450
x-ua-compatible:IE=edge,chrome=1

The Content-Length mismatch definitely looks like the problem. The URL for that is a www.drupal.org page, not any 3rd-party assets.

Drupal itself doesn’t serve a Content-Length header, so it must be added by our CDN or web server. I’m checking with Fastly support to see if they can help, although it is possible it is a problem on our end.

I think this header is being set by nginx. The only recent error logs I can find are occasional upstream timed out (110: Connection timed out) while reading response header from upstream. The nginx proxying has a timeout of 90s.

I am changing the title, since this is not just about forums. Then, I can get the same behavior for Drupal API too.

With Google Chrome 60.0.3112.50 beta and Google Chrome 61.0.3152.0 canary, I get first a white page and, refreshing, the correct page. The content length shown is different between the two cases, but it's never 0.

When I get a white page, the content shown from the Developer Tools are truncated, for example as follows:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" version="XHTML+RDFa 1.0" dir="ltr"
  xmlns:fb="http://ogp.me/ns/fb#"
  xmlns:og="http://ogp.me/ns#"
  xmlns:article="http://ogp.me/ns/article#"
  xmlns:book="http://ogp.me/ns/book#"
  xmlns:profile="http://ogp.me/ns/profile#"
  xmlns:video="http://ogp.me/ns/video#"
  xmlns:product="http://ogp.me/ns/product#">
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  <meta name="HandheldFriendly" content="true" />
  <meta name="viewport" content="width=device-width" />
  <meta name="MobileOptimized" content="width" />
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In both the cases, the HTTP code returned for the main resource (e.g. https://www.drupal.org/u/ramyareddy) is 200.

I am not having these problems anymore. I am setting this as fixed.