Dear Mark van Ommen
You have written there is no antivirus running. In other case the first recommendation is to stop antivirus. Usually it is not simple to stop antivirus fully and placing VideoCAD into "white list" can be useless. Antivrus software have own bugs.
Hundreds of cameras are not a problem with current version of VideoCAD 8.4. Please download and install using the same link and password if you use older version.
Complicated 3D buildings constructed by thousands of faces can decelerate VideoCAD. Its 3D performance is not such high as general 3D design software in spite of our efforts. So it is necessary to facilitate your work materials and disable unused tools.
VideoCAD offers powerful but resource-intensive operations for image processing, which can be enabled or disabled. Disable heavy tools when you do not need them, especially when you work with complicated projects. You can enable these tools before saving or export.
You can disable image processing in the 3D Video window. Main menu>Speed>Disable image processing.
Disable shadow calculation from 3D models (Option box>Miscellaneous tab.)
You can disable constant shadow calculation in the Graphics window. Clear the item Main menu>View>Calculate shadows for active camera.) You will be able to calculate shadows of all cameras on once by clicking Main menu>View>Recalculate shadows. Or recalculate shadows of active camera only (Main menu>View>Calculate shadows for active camera.
Use low resolution projections of 3D models in the Graphics window. Do not stretch the 3D Models window widely when you are clicking on the Save projection button.
Do not use gradient filling of camera projections when you need not.
In the
3D World window decrease resolution of visualisation of camera coverage by the
Resolution combo box on the View tab of the 3D World window. You can disable it when you need not it by the
Coverage checkbox on the View tab of the 3D World window.
When you use background in PDF format, decrease DPI resolution (Main menu>Drawing>Adjust background).
Do not open 3D windows widely when it is not necessary. Do not hold several 3D windows opened on the same time when you need not.
Simplify your AutoCAD background and 3D models of territories. Usually not many details are needed for CCTV design.
Download and install the latest version of VideoCAD using the same link and password. We constantly improve VideoCAD. Current version is VideoCAD 8.5. VideoCAD9 will have several additional impovements in performance.
Always inform us by email in case of an error that can be repeated.
See also
Program speed and system requirements
Errors in rendering 3D images