Avoid excessive updates

[chriddyp]

Fixes issue brought up in https://community.plot.ly/t/callback-is-fired-excessively-in-multi-app-setup-once-for-each-input-instead-of-once-for-each-callback/5789/4

[chriddyp]

I have a preliminary fix available in v0.10.0-rc1. Try it out with:

pip install dash-renderer==0.10.0-rc1

[chriddyp]

Just manually tested this on the dash-docs repo. With this patch, loading http://localhost:8000/dash/getting-started-part-2 results in 47% less requests (25 -> 17)! 🐎

[wtluke]

No luck yet for me @chriddyp. LMK if you want to see my script to help debug (or decide it's a different issue)

[chriddyp]

LMK if you want to see my script to help debug (or decide it's a different issue)

@wtluke - Yeah, that would be helpful. Thanks!

[wtluke]

Emailed 👍

[chriddyp]

@wtluke - It looks like the infinite looping was a separate issue that was caused by having 2 dcc.Location properties with the same ID (dcc.Location(id='url')). (One in runner.py, the other in beehive.py). Removing the duplicate dcc.Location (in beehive.py) fixed the infinite loop for me ✅

Applying this patch to your example seemed to reduce the number of times one of your callbacks was being called from 16 times to just 2 times 🚀 !

[wtluke]

Wow. Wow. Thank you, Chris. And this fix is insane - it has transformed the app into something unbelievably fast! Has caused me a lot of pain (trying to work out ways of avoiding 16 callbacks) - I never realised your solution here (calling it two times, per output) would have been possible. Wish I'd spoken up earlier. Absolutely superb - can't thank you enough.

Onwards!