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CAD tip CAD tip # 6312:

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Making transfer of AutoCAD DWG files faster over WAN.

A - answer Due to the internal compression of DWG files introduced in AutoCAD 2007, 2008 and 2009 larger DWG drawings may transfer more slowly over WAN network connections. This is because the commonly used WAN accelerators (e.g. Riverbed Steelhead) use deduplication methods to optimize the transferred data - the unchanged portions of the files (since the last version) are not transmitted again. But when you use an internal compression, any single edit will change the contents of the whole file and the file has to be always transferred completely.

Autodesk has released the "WAN acceleration hotfix", which introduces an option to change the internal DWG compression so that WAN accelerators can employ their deduplication methods and make the file transfer faster.

To really switch the format after you install the hotfix you have to set the environment variable (in Windows) ACADCOMPRESSIONMODE to 1 (see My computer > Properties > Advanced > Environment variables > New). At the same time you should set the variable ISAVEPERCENT to a larger number (to 100) and use the QSAVE (Ctrl+S) command for saving drawings. DWG drawings are mutually compatible.

You can download the WAN hotfix for all Autodesk CAD application based on AutoCAD 2007, 2008 and 2009:

These settings are not needed anymore for AutoCAD 2010 and higher.
100% *  CAD 
17.9.2008    9870x  
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See also:
Tip 9216:Automatically save raster images edited in Raster Design.
Tip 6515:AutoPDF - Automatic publishing of PDF file on every save of the DWG drawing
Tip 4799:Jumpy crosshair in AutoCAD window.
Tip 4260:AutoDWF - Automatic publishing of DWF file on every save of the DWG drawing
Tip 1011:How to save a ZIPped version of a drawing while saving the DWG?

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