We targeted performance optimizations with the last release, filtering including. However, the filtering concerns recursively traversing through each node and its children. Heavy data might lead to extra time to execute the filter and render the nodes. I suggest that you use kendo.throttle
method to limit the number of calls to the filtering method for certain time which will boost the performance:
Updated the referenced article in a dojo that illustrates its usage: DOJO
dataSource = $(
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