DisplayFusion RSS: BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/RSS/?TopicID=0199b31e-7191-727f-bbe5-a391d232c6d7 DisplayFusion RSS: BFS.Application.Start() slow to return for some applications Sun, 25 Oct 2026 13:50:35 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=0199b31e-7191-727f-bbe5-a391d232c6d7 RE: BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#5 Wed, 12 Nov 2025 18:48:55 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#5 DisplayFusion This is from a change to the way DisplayFusion launches applications. In the upcoming Beta 8 we've added BFS.Application.StartWithoutWait() so you can run things without waiting to get the process ID. ]]> RE: BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#4 Wed, 08 Oct 2025 21:02:12 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#4 DisplayFusion I wasn't able to reproduce this problem on another computer, so I certainly see why you want this info.

I've attached a video to help demonstrate the issue and should provide more context for the logs.

  • 0:04 - The tone is from clearing the DF debug log.
  • 0:08 - Firefox is not running. Running the function starts it for the first time in 95ms.
  • 0:16 - Firefox is still running. Running the function shows the marquee waiting dialog and finishes in 6260ms.
  • 0:28 - Firefox is manually being closed.
  • 0:35 - Firefox is not running. Running the function completes in 67ms.
]]> RE: BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#3 Tue, 07 Oct 2025 17:18:24 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#3 DisplayFusion Could you send me a debug log? Here are the steps:

  • On the DisplayFusion Settings > Troubleshooting tab, change the Logging drop-down to "L1: Log Minimal" and then click "Clear Log"
  • Reproduce the issue and note the time so we'll know where to check in the log file
  • Click the "Export Info to File" button on the Settings > Troubleshooting tab
  • Reply with the file attached
  • Disable debug logging after sending the log
]]> RE: BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#2 Mon, 06 Oct 2025 16:42:26 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7#2 DisplayFusion I did some more experimentation with this and it seems like most if not all console programs will also hang like this. 
nslookup.exe
will have scripts hang if run with no arguments and the process stays running and it will also hang if given an arguement and the process quickly exits.

If you use 
System.Diagnostics.Stopwatch
to benchmark the script, it seems to always be around 6.2 seconds. ]]> BFS.Application.Start() slow to return for some applications https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7 Sun, 05 Oct 2025 06:45:41 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/bfsapplicationstart-slow-to-return-for-some-applications/?ID=0199b31e-7191-727f-bbe5-a391d232c6d7 DisplayFusion DF 11.2b5 seemed to work acceptably. I think I noticed it being slow for DF 11.2b6, but it is certainly the case for beta 7.

BFS.Application.Start()
will take like 5 seconds to return when launching an application that is already running and internally handles new instances of itself. Such as multi-process web browsers or electron-like apps.

Simple applications that are unaware of other instances running seem to work fine.

✅ Quickly returns always:

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C:\Windows\notepad.exe

❌ Slowly returns on 2nd run:

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C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Microsoft VS Code\Code.exe
C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
C:\Program Files (x86)\Winamp\winamp.exe


System.Diagnostics.Process.Start()
in comparison returns instantly in all cases. ]]>