slow picture loading

Hi,

As far as I see, the javascript files are being served directly through apache. Why do you say differently?

Cheers,
Doru

On 27 Nov 2012, at 21:24, Gerhard Obermann [hidden email] wrote:

Hi!

Why are the js files not served through apache.
I have also sometimes long waiting times for the js files only.

BTW we are using Nginx. We moved from apache to lighttp to nginx.
We also compress all js files into one file before serving.

So it seems not be related to the png files only.

Cheers
Gerhard

On Tue, Nov 27, 2012 at 8:34 PM, Tudor Girba [hidden email] wrote:
Hi Bob and James,

Thanks again.

It seems to be that the 15s is too much of a coincidence :).

I put together two experiments that show that the loading problem depends on the amount of images:

- a page with 3 extra images on top of the template. This seems to exhibit the problem for exactly one slow loading image:
http://www.humane-assessment.com/test3ExtraImages

- a page with only 1 extra image on top of the template. This loads fine:
http://www.humane-assessment.com/testOneExtraImage

But, I still do not quite understand where to look next. Any further advice?

Cheers,
Doru

On 26 Nov 2012, at 20:41, Bob Arning [hidden email] wrote:

I wrote a Squeak simulation of the browser loading 14 of the files on your page. I used a separate process for each httpGet: and typically were complete in under 1.5 seconds. When I hit reload on the browser, there are often 1 or 2 files taking a bit over 15 seconds. Suggests something different about how the browser requests data vs. my simple simulation.

Interesting that the response headers are:

HTTP/1.1 304 Not Modified
Date: Mon, 26 Nov 2012 19:19:23 GMT
Server: Apache/2.2.8 (Ubuntu)
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
ETag: "392802a-7974-4cf387f145600"

Is it just a coincidence that the keep-alive timeout is 15 seconds and that the slow files take 15.7 seconds? Attached is an HAR file with the browser timing details.

Cheers,
Bob

On 11/26/12 4:27 AM, Tudor Girba wrote:

Hi Paul, hi James,

Thanks for the answers.

I also thought it has to do with the Apache config, but I had no idea what to look for. Your suggestion certainly look interesting to look into, but I have close to no clue of how to do it. Do you happen to have a bit more hands-on pointers for         how to:
- increase the resources count
- add expire headers for the images

?

Cheers,
Doru

On Mon, Nov 26, 2012 at 5:28 AM, Paul DeBruicker [hidden email] wrote:
I suspect James has the answer but you might also consider doing the
following:

-Add expires headers for the images in Apache and people will only have
to download them once.

-Apache 2.2.8 was released Jan 19, 2008 so I'd definitely spend time
upgrading to the latest stable version just to get the security
vulnerability fixes.

On 11/25/2012 08:11 PM, James Foster wrote:

Hi Doru,

How many resources do you have loading from the same site? Once I had a problem in which Apache was configured (by default) to only provide ten (10) items per second to the same client. I believe this was an attempt to avoid a denial-of-service attack. When I changed Apache to allow 30 items per second then my site loaded much faster.

James

On Nov 25, 2012, at 3:24 PM, Tudor Girba wrote:

Thanks. But, somehow, I think size is not really the issue.

Somehow randomly, one or two of the pictures take significantly more (the delta is measured in seconds) to load than the others.

And yes, I am using the timeline debugging functionality from the browser.

It's strange.

Doru

On 24 Nov 2012, at 10:26, Gerhard Obermann [hidden email] wrote:

Hi Doru,

I would reduce the image size to the displayed size and reduce the bit depth of the png to 8.
I tried it with home-icons-400-200-37.png.
Before: 31.092 Bytes
After: 7.678 Bytes

Cheers
Gerhard

On Sat, Nov 24, 2012 at 8:29 AM, Tudor Girba [hidden email] wrote:
Hi,

I am working on a pier page, and I have a couple of images in it that seem to be slow to load, although they are served through apache.

It is true that the images are slightly large (~230K), but still I think they appear too slow.

The example is here:
http://www.humane-assessment.com/

Anyone has any idea of why this would happen?

Cheers,
Doru

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slow picture loading

Re: slow picture loading