TreeSelect with large data-set causes browser to become unresponsive

[gRoberts84]

Hi there,

I'm using TreeSelect via AntD and noticed that my dataset with approx 4000 nodes was performing extremely slow when expanding/collapsing nodes and especially when searching.

When checking the Big Data example, I had a similar issue, although this managed to cause my browser to crash (in both normal and checkStrictly modes.)

The above picture shows me searching for 0-0, which after taking a screenshot and beginning to report the issue, it finally came back to life:

Browser: Chrome 59.0.3071.115 (Official Build) (64-bit) (OSX)
Available memory: 3.10gb

Is there anyway to improve performance, even in strict checking mode?

Thanks

[tvasenin]

I've somewhat improved filtering performance:
#84
react-component/tree#138

Filtering is still not realtime (as the root cause with excessive node traversal calls is not fixed yet, I've just reduced the overhead caused by these calls), but it should be MUCH responsive.