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Topic: forum (enotify and sso) slowness (Read 2 times) previous topic - next topic


I often noticed slow down of this forum, sometimes I have to wait several seconds (also over ten seconds!) for loading a page. It isn't a issue related to my ADSL, my client, my browser, etc and it happens always. I done a brief analisys with Firefox+Firebug+YSlow I can see some pages that take too much time to load.

The slowest request is done at http://arduino.cc/forum/index.php?action=enotify (between 1.5 and 2 seconds) followed by https://id.arduino.cc/css/sso_bar.css (over 0.8 second, uncompressed) and https://id.arduino.cc/css/sso_bar_js_2.php?s=forum (over 1 second, uncompressed)


I'll revive this old thread.

Today I've experienced a terrible slowness of the forum. It's crawling...

Here's some data (takes some time to load). It's definitely not my local connection.
• Upload doesn't work? Do a loop-back test.
• There's absolutely NO excuse for not having an ISP!
• Your AVR needs a brain surgery? Use the online FUSE calculator.
My projects: RGB LED matrix, RGB LED ring, various ATtiny gadgets...
• Microsoft is not the answer. It is the question, and the answer is NO!

Nick Gammon

The forum is appallingly slow. My same connection works fine on other forums and sites.

And this is the "new" forum too. Can't something be done with it?

Nick Gammon

Try Googling "smf forum slow":

Code: [Select]
About 2,530,000 results (0.16 seconds)


Nov 26, 2011, 03:12 pm Last Edit: Nov 26, 2011, 09:44 pm by robtillaart Reason: 1
I have the impression (no data) that it is slower when the "US is awake" possibly because there are more users logged in ?

From the stats - http://arduino.cc/forum/index.php?action=stats - below you can see that the number of pageviews almost doubled since may. That explains quite a bit ...

Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)


I have the impression (no data) that it is slower when the "US is awake" possibly because there are more users logged in ?

When I get to work in the morning (2AM Pacific Standard Time), the forum is much faster than later in the day. Around 8, it gets really slow. About 2 PM, when I get home, it is much faster again. So, yeah, I'd agree that the US is to blame.

Nick Gammon

That may be the case, but cannot the hardware be "sized" to handle the load? For the forum to take many seconds to process posts, when the USA is "awake" doesn't seem satisfactory to me (even though I am not living there, I am still affected by it).

And if the number of users doubles every year, surely things will only get worse, much worse? Now is the time to take action. Whether that action is improved hardware (server) or better forum software.


Now is the time to take action. Whether that action is improved hardware (server) or better forum software.

I agree. It took >5 seconds to load up the page displayed when I click "Reply to post" or whatever it says. Loading the actual forum takes in excess of 10 seconds. My ISP is incredibly slow, but still not enough to cause the observed effects. To keep the forum usable in the future, it would make full sense to upgrade...
On the other hand, upgrading would most likely be a time consuming and expensive matter. More time and money spent upgrading the forum is less to be spent developing cool new boards and software. It's all a balancing act.
Add to the fact that the nef forum looks good, as I'm sure others will agree, and we have a hard decision. Usability vs. cost & time.

My website: http://www.harryrabbit.co.uk/electronics/home.html Up and running now! (Feel free to look round!) :D


The forums, in fact the entire site, has been getting slower and slower over time.  During the day it's slow for me, to the point where I start getting timeouts.  In the evenings it tends to clear up a bit but by 1-2am (mountain time), it completely falls off of the planet.  Can't reach it, doesn't respond, nothing.  I don't know how long that lasts because I usually go to bed around that time and don't check back for another 7-10 hours later.

Couple of things to keep in mind though.  It may not all be the web server's fault.  When it comes to the forums, there's also an SQL server serving data.  If that gets bogged down, everything goes to hell in a hand basket.  In my experience running web sites, forums, blog, whatever over the last 16 years is to make sure all your failure points are covered.  I do see messages where SMF can't communicate with the SQL server.  I don't know if they have both on the same physical machine, or if things are split into multiple machines.

Personally, I'd start looking at the SQL logs, and start capturing queries that take forever to run and deal with that.  If both the web and SQL are being served from the same machine, split them up.  Lastly, check that the physical machine(s) can still handle the load (and it doesn't seem like they can anymore.)

It's a shame for something so popular to suffer like this.

Nick Gammon

To be honest, it is getting to the point where I don't open threads that don't have an "interesting" title, because I don't want to waste the 30 seconds the page takes to load (and repeat for a whole lot of other pages). And then when I type a reply, it takes another 20 seconds for the reply to appear. It's getting unworkable.

Nick Gammon



Nick Gammon

By the way, SMF is now 2.0.1. We seem to be on 1.1.12.

Rather amusingly, when I went to the SMF site and tried to read the changelog, I got this:

Code: [Select]
Temporarily Unavailable
Due to high stress on the server the forum is temporarily unavailable. Please try again later.

Looks like their own forum isn't coping too well either.


I got that error in this forum yesterday, it was down for maybe 1/2 an hour. I constantly get long delays.

Rob Gray aka the GRAYnomad www.robgray.com


Sorry... I DO appreciate all that is done to make the forum work at all... but I have to add a "me too".

My system runs fine with most sites. It is just when I try to use the Arduino forum (and other Arduino.cc pages?) that I have problems... often my browser just gives up, times out. And no, the setting is set too tight.

Has taken me several tries just to post this. I'm in southern England, if that matters. Problem happens frequently, different times of day. Often if I get one or two slow loads, I'm going to get lots more... but I don't try more than a few times any more, based on prior experience. Maybe some forum readers will be glad I'm online less! Who knows!


Maybe some forum readers will be glad I'm online less! Who knows!

I do. The answer is no. Different perspectives are always good.

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