Let's Make our Dash App Super Fast

[@romanov0]

Thanks for these explanatory videos - they help a lot!

[@Sujay-w3d]

Suppose we have to change the css of an element then how the patch object will reach to the style of that element 7:40

[@Winterbasse]

Thank you for the video. I was running into a problem of duplicate data points using the exendData approach to update dynamic graphs with a pattern-matching callback. While I don't know what causes the issue, replacing extendData with the Patch() method for appending data to graphs has improved the performance of my app and gotten rid of the issue altogether

[@CharmingData]

@@Winterbasse I'm glad you got it solved 🤗

[@hurstcycles]

What about adding an additional trace to an existing figure? Does the existing add_trace function also re render the entire figure? Could it be done with patch? Essentially adding data to a figure that does not already exist on the figure.

[@venkat2132]

@adam how to refresh excel based data frame for every day schedule on multipage dash app where dataset is in different folder? please help me

[@CharmingData]

Try to use DCC.Store on the main page of the app, and then refer to it on the necessary pages

[@venkat2132]

@@CharmingData Does this refresh the excel based dataframe data every day or every hour on the dash app?

[@CharmingData]

@@venkat2132 you can choose the time interval by using dcc.Interval.

[@venkat2132]

@@CharmingData yeah that is okay but what if our df is large and to get to the table/chart we have to do n no of df manipulations and reading/refreshing df every minute/5min dash has to do all this right. Is there way just refresh dataframe in data page so that app page gets latest dataframe data

[@STDFme]

Thanks for explaining Patch, I didn't know it. My figures generally have 100k up to ~1000k points. When I change some selectors, the whole Graph needs to be updated. Will patch still have an advantage in this case or only if some datapoints need an update?

[@CharmingData]

if the whole graph has to be updates with all new points, I don't think Patch would be very useful.

[@lucasbrecht9296]

Thanks for the video, I'am trying to add Patch in my code right now but for some reason I have this erros: "Cannot find reference 'Patch' in __init__.py". Do you know howto solve it?

[@CharmingData]

hi Lucas. did you import Patch at the very top? Do you have Dash 2.9.2 or higher installed?
What is this __init__ .py file?

[@kubernetes2797]

As a superior grogrammer, why you possess long hair that lots of grogrammers also want have