Hi, I think there is some reason:

1. your connection is very slow.
you can try to test your network speed, such as fast.com

2. your firefox have internal bug.
well, you can open developer tools, and watch the request timing tab. it can check which part of request is slow. such as DNS time, send time, wait time.

3. your firefox's UI is not reponse
You can try resize firefox window size while you wait loading. if layout is normal, the UI is OK.

All in all,
we need your more diagnostic information。

On Wed, Oct 11, 2017 at 5:07 AM, Robert P. J. Day <rpjday@crashcourse.ca> wrote:

  i am beyond frustrated with how mind-bendingly slow as a dog is
firefox on my fully-updated F26 system. eg, i go on twitter, want to
just post a tweet, sometimes takes several *seconds* just to finally
get around to responding to keyboard strokes.

  is anyone else seeing this? i am seriously ready to dump firefox
simply because it has turned into such a worthless piece of crap. what
is going on?

rday

--

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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Robert Lu <robberphex@gmail.com>
About me: http://about.me/RobberPhex