Slower cursor updates in 3.6.x · Issue #284 · immutable-js/immutable-js · GitHub

8000 Slower cursor updates in 3.6.x · Issue #284 · immutable-js/immutable-js · GitHub

Slower cursor updates in 3.6.x #284

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Slower cursor updates in 3.6.x#284

I'm experiencing a performance degradation with 3.6.x.

It seems to be caused by the following function:

function newKeyPath(head, tail) {
    return Seq(head).concat(tail).toArray();
}

If I replace it with:

function newKeyPath(head, tail) {
    return head.concat(tail);
}

performances are back to normal.

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