Hello! I’ve really enjoyed using Dash, and have deployed an app to heroku. https://ftacv-simulation.herokuapp.com/ It’s much slower than on my localhost, and I’m trying to find reasons why. I’ve switched to the webgl renderer, and have reduced the amount of data being plotted in some instances. My…

If you are storing a lot of data in a Store, the data will be transferred between the client and the server for each callback, which might slow down the app. If this is the problem, you might experience an improvement by caching the data server side. See e.g. this example, [image] H…

I have been facing the same problem! My solution was not to use dcc.store at all. When you set on your localbrowser the throttle of the Developer Tools to (for example) DSL speed, you will face the same slowness on your localhost. That what made it easy for me to debug locally. [image]

Interesting - can I ask what your alternative solution was?

Hi @Emil and @fohrloop - I have now tried to implement this. The data I pass into store using cached_callback() (which is in the form of a dictionary that can be passed to dcc.Graph()) is empty when read by the plotting function. I’m not sure why this is - is it because it has to be in the form of a…

No, the data can be in any format. Could you share some code? Otherwise it’s hard to tell what goes wrong.

I’m struggling to reproduce the error in a simple example, and I don’t want to post the whole code as its enormous, but the source of the problem seems to be the error : TypeError: object supporting the buffer API required The structure of my code is Apply_changes(button) ↓ …

Ah, I might have an idea about what goes wrong then. A cached callback calculates the key for the cache as an md5 hash of the inputs. In your case, the input itself is a cached callback, which might cause issues if the input data does not support the md5 hash calculation, [Ahmet] …

Just tried to fix it by putting the whole thing in one callback, but of course you still need store as an input to the function… The data is in the form of a dictionary for the graphing options - so a dictionary of strings, where the x and y data are stored as numpy arrays (casting them to list() …

I just tried to reproduce your error, but without any luck. I seem to be able to cache dicts, list and so on. Could you post a small MWE demonstrating the error? Then i’ll try to figure out a fix :slight_smile:

Tips for speeding up dcc.Tabs on dash

Dash Python

fohrloop July 25, 2020, 8:46am 5

Hi @FTACV, in case you missed, there is a recent post by @Emil that could be interesting to you: Show and Tell - Server Side Caching

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Tips for speeding up dcc.Tabs on dash

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