The Ideate tech team has seen a recent increase in cases
related to poor performance, slow opening and saving of files, and a number of
crashes when using basic AutoCAD commands.
When these types of issues occur, one of the first things we look at is
file size (is the file larger than expected) and file cleanup tools.
Two of the most common contributors to abnormal file size
and poor drawing performance are Scale Lists, and RegApps. When the number of these items in a file
increases, so does the file size, which hinders drawing performance.
The AutoCAD Scale List is a list of pre-defined drawing and
annotation scales that are saved in a drawing file. Scales can easily be selected from the list
to automatically resize any annotative content, like lineweights and annotative
text, dimensions, and multi-leaders. Scale Lists can also be used to quickly set a scale for viewports
created in a layout tab. In order for a
scale to be selected, it must be defined and included on the list. Scale lists are also updated to include
scales from external reference (XREF) files and other objects that contain
scales that were not previously defined in the drawing’s original Scale
List. This can add tens or even 100+
scales to an existing drawing, many of which aren’t necessary for final plan
sets. Scale Lists should be cleaned of
excess scale values when possible.
In the case of RegApps, according to Autodesk, RegApp is
short for “registered application." It is linked to “extended entity data” (XDATA) that is attached to
drawing objects through use of Autodesk’s provided APIs. Unreferenced RegApps appear in a drawing when
the original objects that contained XDATA are deleted from the file. Because the RegApp remains after the object
has been deleted, it’s an extra bit of data that contributes to larger file
sizes and negatively impacts performance of a drawing. Unregistered RegApps need to be purged from a
file in order to remove them from the drawing’s database.
Scale Lists and RegApps can be manually removed from
individual drawings using a couple of drawing cleanup commands, but there are
some misunderstandings that we’ve run into in the past as well.
The SCALELISTEDIT
command can be used to access the Edit Drawing Scales dialog box. From the dialog box, you can delete existing
scales from the drawing, or use the Reset option to reset the scale list to the
default values. Although they are
similar, the results of the two options are quite different. If you select all scales in the drawing (you
can use shift+left click to select multiple items) and use the Delete option,
only scales that are not in use will be deleted. Any scales that are currently referenced in
the drawing will remain on the list. If
you chose the Reset option instead of delete, you will be prompted to select a
default scale list (imperial, metric or both).
In this case, the existing scale list will be replaced by the default
option selected. Any custom scales added
to the list will disappear, along with any unreferenced scales. You may also end up adding additional
unreferenced scales since it is importing a full list of defaults rather than
just what’s being used in the drawing. In any cases, both options should help with issues related to excessive
scales, but the Delete option does appear to reduce the number of scales in the
file more than the Reset option.
RegApps must be purged from a drawing, but they are not
found in the standard PURGE command. In
order to access the RegApps option, the –PURGE command must be used. Adding the “-“ symbol to the front of an
Autocad command like PURGE will give you access to the root options built into
that command. The list of additional
purge options will appear and allow you to select these added features along
with the standard objects that the PURGE command allows.
One of the biggest misunderstandings with this –PURGE list is the “ALL” option located
at the bottom. Although it says ALL,
that option does not include everything in the list. The PURGE command is also limited to removing
one level of reference at a time, requiring multiple uses of the PURGE command
in some cases before all unused data has been removed. For RegApps, Zero-Length Geometry and
Orphaned Data, these items must be selected individually for removal and are
not part of the “All” option. The Purge
command also does not remove unnamed objects from blocks and locked layers, so
some of these may remain in the file after the process is complete.
The two commands mentioned above (ScaleListEdit and –PURGE)
are individual drawing based commands. In order to help with the cleanup process of multiple files, Autodesk
has created two utilities that can be downloaded and added to your Autocad
installations. Both utilities are setup
for multiple files (batch processing) and work in a dialog box external to the
Autocad application, eliminating the requirement for each file to be opened and
cleaned manually.
The RegApp ID Cleanup Utility can be found here (for
versions 2008-2016).
The ScaleList Cleanup Utility can be found here (for
versions 2008-2016).
The links also include instructions on how to install the
utilities and how to run them after installed. The files need to be copied to the Autocad installation folder for the
version you are installing, which is typically found at: C:\Program Files\Autodesk\AutoCAD <version>
The CleanupRegapp.exe will launch a dialog box that looks
like this:
From here, you can load files or select entire folders for
removal of RegApps in one bulk process. This is extremely useful in the case of XREF files, where RegApps in an
XREF may carry over back to the base file even after that file has been purged.
The CleanupScales.exe file launches this dialog:
From here, you can select files
or folders and choose to remove unreferenced scales down to a user defined max
value and select a reference template for populating the new scale list similar
to the Reset option.
On a recent support case, using
these utilities on a set of 18 drawings in a project folder removed over
200,000 RegApps and 500+ Scales from the scale list, and some drawing files
were reduced to 50% of their original size, which significantly improved
performance in Autocad.
Next time you’re running into
issues with poor performance or long lag times and freezes when working with
basic commands, remember these two utilities and see if they are able to fix
the problem. And for more information on
drawing housekeeping tools in AutoCAD, check out this post from fellow ENI Tech
Daniel Armstrong.
Thank you for reading. For more information on AutoCAD and other Autodesk products, and information on training and consulting for the various products Ideate services, visit our website at www.ideateinc.com.
ENI Manager & Senior Application Specialist
Matt is an ENI Manager and Senior Application Specialist in Ideate, Inc.’s Seattle office. He has a B.S. in Mechanical Engineering and is a licensed Civil Engineer. Prior to joining Ideate, Matt worked as a civil engineer, using Civil 3D on a variety of projects including site development, roadway improvements and infrastructure design. With over 10 years of experience in the civil engineering industry, Matt now provides training, consulting, technical support, and implementation strategies for organizations transitioning to Civil 3D. Matt is an Autodesk Certified Instructor (ACI), as well as an Autodesk Certified BIM Specialist: Roads and Highway Solutions. Additionally, Matt is and Autodesk Certified Professional for AutoCAD, and AutoCAD Civil 3D. He can be found on twitter as @MattM_PE
