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Diagnosing intermittent slow page loading

Apologies in advance if I use terminology incorrectly. I've had this strange but intermittent issue for a while (through multiple Firefox versions) where pages will take… (read more)

Apologies in advance if I use terminology incorrectly.

I've had this strange but intermittent issue for a while (through multiple Firefox versions) where pages will take a long time to load. I haven't timed loads exactly but I can confidently say it's a minimum of 10 seconds. The problem with diagnosing this issue is it's very intermittent; I can go hours or on a rare occassion days without it happening (I think, maybe I've just not registered some of the times it's happened). I have yet to try disabling all addons because of this.

Random quirks about the issue:

  • It only happens on navigation to a new domain (or to a domain from a new tab). Once a domain has loaded, I don't have an issue on said domain for a while.
  • It isn't tab specific. I can open a new tab in the same window and they will both take the same amount of time to load, often finishing at the exact same time.
  • While waiting for a page to load, I can open a Private Browsing window, paste the URL, and the page will load immediately without issue in the Private Browsing window. This does not affect the page being loaded in the main window.
  • I believe it has occurred immediately after a system restart, thus I don't believe it is related to long-running sessions.

The addons I have that don't also run in Private Browsing are:

Asked by clarke980 1 day ago