BUG: VDM Apps Can Cause Other Applications to Redraw Slowly (140515)


The information in this article applies to:

  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Server 3.51
This article was previously published under Q140515

SYMPTOMS

On WinNT 3.51, moving a VDM Application on the screen or changing its focus in relation to other 16-bit or 32-bit Windows-based applications (moving to the foreground or background) causes the Windows-based applications to redraw slowly taking four to six seconds.

CAUSE

Some VDM applications, such as Microsoft QuickBasic applications or Edit.com with the menu pulled down, have a thread that loops tightly while waiting for keyboard input. This thread, always being in the run/ready state, slows the redraw of other Windows-based applications.

WORKAROUND

This problem can be eliminated by creating a .pif file for the VDM Application using Pifedit.exe. Click the Advanced button, and reduce its Foreground and Background Priority by half.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
Modification Type:MajorLast Reviewed:10/23/2003
Keywords:KB140515
©2003 Microsoft Corporation. All rights reserved.