# Lister opens after 30 sec

**URL:** <https://resource.dopus.com/t/lister-opens-after-30-sec/45242>\
**Category:** Help & Support\
**Tags:** antivirus-issue\
**Created:** [August 1, 2023, 11:23am UTC](https://resource.dopus.com/t/lister-opens-after-30-sec/45242 "2023-08-01T11:23:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![radi0n](https://resource.dopus.com/user_avatar/resource.dopus.com/radi0n/32/35049_2.png) [@radi0n](https://resource.dopus.com/u/radi0n)\
**Post date:** [August 1, 2023, 11:23am UTC](https://resource.dopus.com/t/lister-opens-after-30-sec/45242/1 "2023-08-01T11:23:36Z")

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When I had ESET Smart Security installed, the Dopus window appeared immediately after double-clicking on the desktop. After uninstalling (end of license) ESET I started using Windows Antivirus. Now the window opens after about 30-40 seconds on the desktop.

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**Author:** ![Leo](https://resource.dopus.com/user_avatar/resource.dopus.com/leo/32/69732_2.png) [@Leo](https://resource.dopus.com/u/Leo)\
**Post date:** [August 1, 2023, 1:35pm UTC](https://resource.dopus.com/t/lister-opens-after-30-sec/45242/2 "2023-08-01T13:35:14Z")

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If your Opus config loads toolbar/menu icons from lots of different exe/dll files, that might cause bad antivirus software to take a long time scanning all the files on each launch.

(Windows Defender is pretty bad these days, in terms of performance impact and causing more problems than it prevents.)

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**Author:** ![AlbatorV](https://resource.dopus.com/user_avatar/resource.dopus.com/albatorv/32/25847_2.png) [@AlbatorV](https://resource.dopus.com/u/AlbatorV)\
**Post date:** [August 1, 2023, 4:04pm UTC](https://resource.dopus.com/t/lister-opens-after-30-sec/45242/3 "2023-08-01T16:04:35Z")

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For a few months, I did not understand why the viewer took 5 seconds before being displayed.  
I now understood by reading this post, I added 2 shortcuts to 2 software in the toolbar.  
I extracted the icons from the applications exe file, just replaced the button icons and now the viewer opens instantly.  
😍

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**Author:** ![lxp](https://resource.dopus.com/user_avatar/resource.dopus.com/lxp/32/33734_2.png) [@lxp](https://resource.dopus.com/u/lxp)\
**Post date:** [August 1, 2023, 6:51pm UTC](https://resource.dopus.com/t/lister-opens-after-30-sec/45242/4 "2023-08-01T18:51:03Z")

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I learned that the hard way as well a few years ago after liberally using a 1 MB image as an icon that needed to be resized every time a toolbar was loaded 😊

Maybe that's something Opus could do automatically: extract the icons when the exe/dll is inserted and only update them on demand or when the host file changes.