Bryntum Support Forums

Hi Bryntum Team,

I am currently working on a project using Bryntum Gantt and have a dataset with 40,000 tasks.
I noticed that when I expand the first task, the application gets stuck for several seconds. Similarly, when I add a new column, the app freezes temporarily, and I also see some white images appearing in the Gantt during this freeze I have attached the image for your reference.

I have attached a CodePen with the example: https://codepen.io/Catherine-R-the-solid/full/pvjYKOm

I am currently using buffered rendering but the performance issues still occur with this large dataset.

My questions:

Is there a recommended way to handle tens of thousands of tasks in Bryntum Gantt without freezing the UI?

Are there specific settings or techniques to improve expand/collapse performance and column updates?

Any guidance, best practices, or configuration tips to improve performance would be greatly appreciated.

Thank you!

Hi,

Could you please provide steps to reproduce the issue? I do not see any freezes using test case you shared. Please see video attached.

Hi,

Thanks for checking. I’ve recorded a video on my side where the issue occurs - when I expand the first task or add a new column, the grid freezes for a few seconds before becoming responsive again.

I’ve attached the video here for your reference. Could you please check and let me know how this can be resolved?

Hi,

What machine do you use? I see some lags, but 40k tasks - it's a lot, and it might cause some lags depends on machine. We also did some improvements for data loading - in v.7.0 it will work faster than now.
Re to your request about configs for performance improvements, I suggest to review our bigdataset demo https://bryntum.com/products/gantt/examples/bigdataset/ and settings we used in there.

Thanks for your response. I’m currently working on a machine with the following specs:

Processor: 13th Gen Intel(R) Core i7

RAM: 32 GB

System type: 64-bit OS, x64-based processor

Given these specs, I would expect it to handle 40k tasks fairly smoothly, but I’m still noticing lags when expanding tasks or adding new columns. I reviewed the big dataset demo, and I noticed that even with 20k tasks, the app freezes when I add a new column or scroll.

To help illustrate the issue, I’ve attached a CodePen example https://codepen.io/Catherine-R-the-solid/full/pvjByrQ along with a video recording that shows the freeze happening. Could you please take a look and let me know if there are additional configurations or optimizations I can apply?

Thank you for sharing more information and your patience!

Could you please take a look and let me know if there are additional configurations or optimizations I can apply?

I am afraid, bigdataset demo already use all configs that might help in performance. The thing is that we tested it on our side in 3 machines and we do not have these freezes, it takes less than a second to re-draw when you scroll fast.
Anyway, I will talk to our architect if we could do something with it, 40k tasks this is quite impressive amount of tasks.
I will keep you updated!