Slow Performance Running VB 3.0 Applications on Windows NT

• Microsoft Windows NT Workstation versions 3.5 and 3.51
• Microsoft Windows NT Server versions 3.5 and 3.51
• Microsoft Visual Basic for Windows, version 3.0

SYMPTOMS

Multiple Microsoft Visual Basic (VB) 3.0 applications running in separate memory spaces will slow the operating system significantly when opening a messagebox.

RESOLUTION

Use a custom form instead of a message box, or upgrade to VB 4.0.

-or-

For Windows NT 3.51 systems, apply the hotfix described below.

-or-

For Windows NT 3.5 systems, upgrade to Windows NT 3.51, and then apply the hotfix described below.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.51. A supported fix is now available, but is not fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Product Support Services for more information.

MORE INFORMATION

Steps to Reproduce Problem

1. Create an application in VB 3.0 that has a form with a button that runs a message box using the MsgBox function.

2. Run 3 or more instances of the application in a separate memory space.

3. Press the command button on one of the forms and notice the performance degradation.