# White Thumbnail Problem

**URL:** <https://talk.observablehq.com/t/white-thumbnail-problem/1233>\
**Category:** Feedback\
**Created:** [September 20, 2018, 7:09am UTC](https://talk.observablehq.com/t/white-thumbnail-problem/1233 "2018-09-20T07:09:56Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![bumbeishvili](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/bumbeishvili/32/4220_2.png) [@bumbeishvili](https://talk.observablehq.com/u/bumbeishvili)\
**Post date:** [September 20, 2018, 7:09am UTC](https://talk.observablehq.com/t/white-thumbnail-problem/1233/1 "2018-09-20T07:09:56Z")

</div>

Thumbnail is not generated for this notebook

> **[D3-Dag - CoffmanGraham](https://observablehq.com/@bumbeishvili/d3-dag-coffmangraham)**
>
> Import

Sadly, In the collection, the thumbnail is not generated only for this particular notebook

[https://beta.observablehq.com/collection/@bumbeishvili/d3-dag](https://beta.observablehq.com/collection/@bumbeishvili/d3-dag)

I think the issue is related to the notebook running time (it’s about 10 seconds before result)

---

<div class="post-metadata">

**Author:** ![tom](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/tom/32/2262_2.png) [@tom](https://talk.observablehq.com/u/tom)\
**Post date:** [September 25, 2018, 6:11pm UTC](https://talk.observablehq.com/t/white-thumbnail-problem/1233/2 "2018-09-25T18:11:40Z")

</div>

Hi David,

Yep - it’s the running time. Thumbnails are currently generated on a headless chrome instance with an execution limit of 30s. Given that this takes about 10s on my fancy MacBook, it’s likely taking a bit over 30s on the relatively smaller server instance.

---

<div class="post-metadata">

**Author:** ![bumbeishvili](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/bumbeishvili/32/4220_2.png) [@bumbeishvili](https://talk.observablehq.com/u/bumbeishvili)\
**Post date:** [September 25, 2018, 6:45pm UTC](https://talk.observablehq.com/t/white-thumbnail-problem/1233/3 "2018-09-25T18:45:09Z")

</div>

> [@bumbeishvili](#):
>
> D3-Dag

One more problem I observed is call stack count limitations

[Named Colors / David B. | Observable](https://beta.observablehq.com/@bumbeishvili/named-colors) .

It works on the laptop, but as it looks like, maximum call stack error is fired when headless chrome visits it

Seems pretty weak server

 ![28%20PM](https://canada1.discourse-cdn.com/flex030/uploads/observablehq/original/2X/a/aacee4c5c51da7b79326eb1fbfc0f500d3ff2d29.png)