So I have a fairly complex dashboard hiding behind a Loading component, and every time a callback is fired, it became really sluggish and Chrome profiler showing a 5 secs ‘Recalculate Style’, and this points to a culprit Forced reflow ( Avoid Large, Complex Layouts and Layout Thrashing | Web Fundam…

Just to verify, could you report which version your on? print(dash.__version__) . and if you are on an older version, could you try upgrading and see if the issue remains? pip install dash —upgrade

Thanks for the reply, I’m on Dash 1.12.0; dash-core-components is 1.10.0 . I could try updating the library, but even with my current versions, is it likely to cause this problem? I have some production system on the version so prefer to stay with the these ones…

We did change the internals behind how the loading behaviour works in 1.13.x in order to improve the performance, so it’s possible this could help your situation.

[image] mega Dash v1.13.3 Release: Improved performance, clientside callback_context, many dcc.Graph & DataTable bug fixes Dash Python Update: version 1.16 has been released since this was posted. Dash v1.13.3 is a minor release featuring: Improved performance for app…

Okay so i have tried in v1.13.4, unfortunately, no obvious difference still very slow with loading component.

dcc.Loading Component Causes Forced reflow therefore very slow

Dash Python

chriddyp June 29, 2020, 1:17pm 5

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dcc.Loading Component Causes Forced reflow therefore very slow

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