While I haven't noticed that this is more prevalent with 52.2 and up, we did get a recent notice on Scientific Linux 7 that it is hanging up and all around being slow. I've noticed it myself for the entire 52 ESR line, and recall it being annoyingly slow, if usable in 45 on Windows 7 also... I.e. Firefox having a hanging UI randomly based on web page isn't anything new to me.

James Pulver
CLASSE Computer Group
Cornell University

On 03/07/2018 08:09 AM, Josh Frye wrote:
Fwd:  Stupidly Slow Firefox ESR (RJRiley.C)

We have several thousand installs of ESR 52.6.0 and there has not been a report 
yet about slowdowns like your experiencing. The only add ons those installs 
have are the ones put in by the users. I do add that we are on Win 10 
Enterprise, 64 bit, with 64 bit Firefox.


Josh Frye
Classroom Support Technician
Ivy Tech Community College
(office) 812-298-2448


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    1.  Fwd: Re:  Stupidly Slow Firefox ESR (RJRiley.C)


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Message: 1
Date: Sat, 3 Mar 2018 21:30:12 -0500
From: "RJRiley.C" <rjri...@rjriley.com>
To: Enterprise@mozilla.org
Subject: [Mozilla Enterprise] Fwd: Re:  Stupidly Slow Firefox ESR
Message-ID: <4188d24b-272f-41bc-af97-fc97a7ace...@rjriley.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Not only slowing down over time, but also crashing.? I have noticed that

certain web sites cause this, one example is mlive.com, where just three 
concurrent web pages loaded would bring a 4th gen I7 with nearly a 8000 
CPUBenchmark rating down. Problems with Firefox have become so frequent that I 
now rarely use it. I would appreciate feedback on why mlive.com is such a 
problem. RJRiley

On 3/2/2018 12:00 PM, Java Sys wrote:
Summary: Firefox ESR v52.1 even with 26 add-ons runs fast, is stable,
and uses a low memory footprint - compared to any more recent Firefox
ESR releases.

We shall stay with this Firefox ESR v52.1as long as seems sensible -
and then turn to an alternative to Firefox if the Firefox ESR at the
time is still as slow as, for example, Firefox ESR v52.6.0 (although
all these v52.6.0, v52.5.3, and v52.2.1 were also unacceptable slow
and require far too much memory c.f. Firefox ESR v52.1 )

Like many others it seems, we've experienced a slowing down of Firefox
ESR over time which recently has resulted in stupidly slow Firefox ESR
performance.

Initially we tried creating brand new profiles, which helped for a
(very short) period but slowed back to unacceptable levels within a
few days of (our) normal usage after re-adding back the 26 add-ons.
After reading comments on this list about reverting back to an earlier
version we tried this with Firefox ESR versions v52.6.0, v52.5.3, and
then v52.2.1 - all suffered the slow down after some normal usage
after a few days.
Immensely annoying and very, very time consuming to test, we tried
removing all add-ons which made a small difference but not for long,
we tried disabling safe browsing, and then zapping the SB files, again
some help but after a few days slowing back to treacle speeds again.

However, a glimmer of light for us began with a reversion to Firefox
ESR v52.1 which, even with our full complement of 26 add-ons and usual
extensions has maintained full performance for many days now.

I offer this missive aimed at two groups of folks:
? (a) folks like myself needing a version of Firefox ESR that works
well and fast, and ? (b) hopefully the Firefox developers can try and
work out where they've gone so badly wrong with more recent versions
of Firefox ESR, ?????? as reverting back to the near magical Firefox
ESR v52.1 has been a wonderful experience, reliable, fast, and usable
again ???????? - with many, many tabs (around 100) spread across 8-10
windows here, yet still a small memory footprint and I'll say it
again, great speed performance ???????? - with ALL our add-ons running
nicely too.

Please Firefox devs, sort out the newer Firefox ESR performance (speed
& memory especially) before we all leave Firefox as unworkable.

Cheers,
Happy Firefox ESR v52.1 users!



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