Visual Basic Applications run very slow in AutoCAD 64bit

If you use VBA inside of 32bit AutoCAD you will have noticed that it is around 1000x times slower when running the same VBA code inside of 64bit AutoCAD.

This is because AutoCAD 64bit ships with the 32bit VBA DLL in a separate out-of-process executable rather than loading the VBA DLL inside of AutoCAD itself. Therefore, a lot of marshaling is incurred communicating between the out-of-process VBA executable and 64bit AutoCAD.

Other issues you may be seeing: Run-time error ‘429’: ActiveX component can’t create object

The Solution:

The best solution is to install 32bit AutoCAD on 64bit Windows, here are the affected versions along with their solution text…

Copyright 2017 (c) Longbow Software

Installing 64bit AutoCAD 2008 on Windows 10, Windows 8 and Windows 8.1 64bit

Your 64bit AutoCAD 2008 was never designed to run in Windows 10, Windows 8 or Windows 8.1 64bit (these versions of Windows are newer than AutoCAD 2008). In order for your AutoCAD 2008 to run as it did in previous versions of Windows, you need to follow these easy steps…

NOTE: These steps do not bypass normal Autodesk licensing/authorization, you should expect to use your own serial numbers in the normal way.

  1. Obtain your copy of the Longbow Converter here
  2. Install your 64bit AutoCAD 2008 as normal.
  3. Once the installation process is complete, close the setup program then start the Converter software; select the 3rd tab, pick the newly installed C:\Program Files\AutoCAD 2008 folder, then click “Fix’
  4. Now you can happily run your AutoCAD 2008 64bit on Windows 10, Windows 8 and Windows 8.1 64bit.

Troubleshooting:

– If you are unable to activate your product, or the activation process crashes:

– If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

Copyright 2015 (c) Longbow Software