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Same issue here: https://www.syncfusion.com/forums/167371/performance-of-dropdown-tree
I have create a SlackBlitz sample.
With as little as 500 elements, allowing a user to "Select All" and "Unselect All" causes the browser to lock up for a period of time.
20.4.49 version, we have improved the performance-related issues while
performing Select All/Unselect All operations on the Dropdown Tree component.
Check out the release notes below.
result, we recommend that you update the packages once to the most recent
version. For your reference, we have attached a sample.
issue still persists, share with us the exact steps you have followed to
replicate the issue, as well as a sample. Check out the shared sample and get
back to us if you need any further assistance.