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The code sample and screen log in the attched file.
This is a about 4 level tree.
Almost the same code.
The different is if using the[WebAssembly]. the same code takes almost 5s to show the data.
I have take many test about it.
If I using id,parentid,desczh, 3 fileds(a new class to build the sample) to show the tree, it can show quickly.
I have the see the same question in the forum.
There is no satisfactory answer.
https://www.syncfusion.com/forums/154398/performance-treegrid
I have update the code.
Nothing about the levels.
It may show very slow in blazor frame work.
The below code show if using 4 lelels.
I have add a page [tree grid 2]
It can control the counts of the items to generate.

