[ANGULAR] Performance Issue with 40k Tasks in Gantt – App Freezes When Expanding Tasks or Adding Columns

[gokulnaths]

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!

[alex.l]

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.

[gokulnaths]

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?

[alex.l]

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.

[gokulnaths]

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?

[alex.l]

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!