Hello Siddhesh,
Gantt performance depends not only on the number of tasks and links, but also on the enabled features.
I don’t see any issues in the following samples when I add 5000 tasks and links: https://snippet.dhtmlx.com/ri1b3mth
Probably, the issue is related to the Gantt configuration, but it is hard to suggest what might be wrong as I don’t see your code.
Please add your configuration to the following snippet and make sure that the issue is reproduced there:
Then, click on the Save button and send me the link.
Or send me a ready demo with all the necessary JavaScript and CSS files so that I can reproduce the issue locally.
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