Optimisation?

[JamesRobertElliott]

Hi All,

I've seen a few posts here referring to the removal of client side optimisation to tackle a lot of problems. What is the down-side of doing this please? Will my Mb usage be much higher?

Thanks

[lepetitlapin]

Yes, it'll mean you download a bit more data per image.

[Retired-James]

Hi Jelliot,

Lepetitlapin, is spot on here, by removing the Optimisation option on your modem it simply means that it loads a web page as it would appear on a normal computer with a fixed line Broadband connection.

The main differences you may encounter would be;

Higher data consumption due to full graphical content,
Possibly slower load up as is loading full graphical content.

If you have any other questions please let us know.

James
eForum Team

[JimmyQ]

Hi All,

I've seen a few posts here referring to the removal of client side optimisation to tackle a lot of problems. What is the down-side of doing this please? Will my Mb usage be much higher?

Thanks

Good luck with achieving it.

[JamesRobertElliott]

Hi Jelliot,

Lepetitlapin, is spot on here, by removing the Optimisation option on your modem it simply means that it loads a web page as it would appear on a normal computer with a fixed line Broadband connection.

The main differences you may encounter would be;

Higher data consumption due to full graphical content,
Possibly slower load up as is loading full graphical content.

If you have any other questions please let us know.

James
eForum Team

Thanks for the response. Is there anymore technical information on this? For example, removing it was suggested as a fix for .zip files be re-compressed in an unrecognisable format. This is slightly more than simple image scaling...

Rgds

[lepetitlapin]

I've never had the client side optimisation component installed but lately compressed files have been mangled, presumably by the network side 'optimisation'.

[Retired-Jon_V]

Thanks for the response. Is there anymore technical information on this? For example, removing it was suggested as a fix for .zip files be re-compressed in an unrecognisable format. This is slightly more than simple image scaling...

Rgds

Hi Jelliott,

Unfortunately the optimisation client was developed by a third-party, and so we don't have any specifics of how it works - but the usual idea is that you take an unoptimised file, and remove any empty space from it, and compress as much information as possible into short code, that can be re-translated and uncompressed at the other side.

This is how it works for images, and the same is true for files as well. The problems occur when files are already compressed or are transmitted over a secure encypted connection. With compressed files, the act of trying to compress them further can sometimes mean that information is lost, and the file cannot be recovered. With an encrypted transmission, such as a website using https:// addresses, the same thing happens - after the information has been translated by our compression software, and uncompressed at the other end, it no longer exactly matches the original - and this causes the entire translation of the encrypted transmission to fail also. With compressed and encrypted files, the information needs to be maintained in exactly the same format it was sent in, otherwise it is no longer readable.

Jon

eForum Team

[lepetitlapin]

...Unfortunately the optimisation client was developed by a third-party, and so we don't have any specifics of how it works...

You cannot be serious. Sounds like good business practice abounds over at Vodafone; I know our company doesn't request documentation when we buy / commission software... *rolleyes*

So what you're saying appears to be that already compressed files (.ZIP, .TAR etc.) cannot be downloaded using one of your connections?

[joe38]

Hi Jon

With compressed files, the act of trying to compress them further can sometimes mean that information is lost, and the file cannot be recovered.

I would like to point out that all pictures and graphics that use the common formats like JPEG, GIF, PNG etc are already compressed and will become mangled if you try to compress them again.

According to this site -
http://www.bluecoat.com/news/pr/228
It is your Blue Coat proxy server that does the network "optimisation" compression. Perhaps you could look at the other threads here that are having similar problems such as -
http://forum.vodafone.co.uk/index.php?show...mp;#entry166548
and
http://forum.vodafone.co.uk/index.php?show...mp;#entry166584

The last one are now trying to "tunnel" through your network just to avoid your Blue Coat Proxy server, that has incorrectly applied "214 begwsl13 Transformation"

It is the same Blue Coat Server that (sometimes) applies the "Content Control" and there are a number of people here who from time to time have problems with re-occurring "Content Control"

And lets not forget those that have recently been having problems with https/SSL sites.

With an encrypted transmission, such as a website using https:// addresses, the same thing happens - after the information has been translated by our compression software, and uncompressed at the other end, it no longer exactly matches the original - and this causes the entire translation of the encrypted transmission to fail also.

Is there a common theme here - your Blue Coat server?
Is this just a coincidence ?

And the main job of your network compression is to save you the trouble of providing adequate bandwidth to serve your paying customers.

Joe38

[Retired-Reidar]

Hi Joe

Althought the optimisation issue has been associated with some of the problems customers are having we cannot confirm this to be the exact cause, there are plans to look at the implementation of optimisation within the VMC software, particularly in future releases of the application.

For the bebefit of other members version 9.3 will not allow for the removal of optimisation, version 9.2 howerer, will. I have linked to the older software and users withing to remove optimisation may download it freely.

Many thanks

Reidar

eForum Team