# Is there a DVL bug?

**URL:** <https://community.thunkable.com/t/is-there-a-dvl-bug/2047514>\
**Category:** Issues / Bugs\
**Created:** [September 18, 2022, 7:13pm UTC](https://community.thunkable.com/t/is-there-a-dvl-bug/2047514 "2022-09-18T19:13:14Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![bibbi](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@bibbi](https://community.thunkable.com/u/bibbi)\
**Post date:** [September 19, 2022, 4:16am UTC](https://community.thunkable.com/t/is-there-a-dvl-bug/2047514/3 "2022-09-19T04:16:08Z")

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hi

my biggest problem is the display of a series of data from a table used as the data source of a dvl (a custom dvl)  
it’s jerky and it takes forever  
I had another difficulty it was the click but that’s solved

here are the blocks i use

 ![Capture d’écran 2022-09-19 à 06.18.52](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/7/f/7ff9b3e212e2c88c19e4af08f4d4b7040e48a32d.png)

i found this post

> [@Data viewer rows desapear](https://community.thunkable.com/t/data-viewer-rows-desapear/1575769):
>
> Hello! I’m new on thunkable, but studing hard to improve my skills on app development. I just started my first project in the last 2 weeks, that will use Firebase + Local Datasource + Data Viewer List approach to show data to the users. I took some time to understand the logic behind the sync in the “do” blocks, but now after hours and hours testing, changing, reading forums, I can’t solve the Data Viewer List problem that happens after I load the data from Firebase to show the data to the us…

these blocks are complete lists and yet the loading of about twenty lines takes a lot of time  
moreover in a second block group I also use a json block and it’s not terrible on my phone on the other hand on my pc it’s ok

it is about recursive function i am unable to implement it in my case

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