# Python extremely slow to open

**URL:** <https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924>\
**Category:** Revit\
**Tags:** python, dynamo\
**Created:** [July 13, 2026, 9:37am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924 "2026-07-13T09:37:21Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![RDM](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RDM](https://forum.dynamobim.com/u/RDM)\
**Post date:** [July 13, 2026, 9:37am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/1 "2026-07-13T09:37:21Z")

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For Revit 2026 using Dynamo 3.6.2, when I edit the python node to adjust some code it spins for 30 seconds.

Closing and opening Dynamo doesn’t change the behavior.

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**Author:** ![RMohareb](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/rmohareb/32/120534_2.png) [@RMohareb](https://forum.dynamobim.com/u/RMohareb)\
**Post date:** [July 13, 2026, 10:17am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/2 "2026-07-13T10:17:53Z")

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> [@Revit 2026 with Dynamo 3.6 visual bug](https://forum.dynamobim.com/t/revit-2026-with-dynamo-3-6-visual-bug/114608/14):
>
> Tried multiple solutions and none worked, eventually the solution was to re-install Revit 2026 completely.

first uninstall the revit and then reinstall it.

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**Author:** ![c.poupin](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/c.poupin/32/89152_2.png) [@c.poupin](https://forum.dynamobim.com/u/c.poupin)\
**Post date:** [July 13, 2026, 4:00pm UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/3 "2026-07-13T16:00:20Z")

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Does this happen with all Python engines? Do you have other Autodesk software, such as 3ds Max?

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**Author:** ![RDM](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RDM](https://forum.dynamobim.com/u/RDM)\
**Post date:** [July 14, 2026, 1:01am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/4 "2026-07-14T01:01:58Z")

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This is on a fresh Revit install

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<div class="post-metadata">

**Author:** ![RDM](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RDM](https://forum.dynamobim.com/u/RDM)\
**Post date:** [July 14, 2026, 3:18am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/5 "2026-07-14T03:18:18Z")

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Happens with both IronPython2 and CPython3, don’t have 3DS max.

In Dynamo Sandbox the code opens immediately, I will uninstall some packages and see if it’s related to that.

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**Author:** ![RDM](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RDM](https://forum.dynamobim.com/u/RDM)\
**Post date:** [July 27, 2026, 1:31am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/6 "2026-07-27T01:31:56Z")

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Tried removing all packages, didn’t change anything

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**Author:** ![RDM](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RDM](https://forum.dynamobim.com/u/RDM)\
**Post date:** [July 27, 2026, 6:50am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/7 "2026-07-27T06:50:28Z")

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Solution was disabling Revit add-ins, eventually found the one causing an issue. But I’m not sure how the Revit Add-in would affect the editing of the Python node.

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [July 27, 2026, 7:45am UTC](https://forum.dynamobim.com/t/python-extremely-slow-to-open/114924/8 "2026-07-27T07:45:43Z")

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Loading a conflicting version of the components used for the UI, a Python library pr components, or any other aspect. Look at the DLLs contained in that add-in as that can narrow it down.