Status: New
Owner: ----
New issue 3611 by [email protected]: Adding a new object property is
very slow
https://code.google.com/p/v8/issues/detail?id=3611
The following three quite similar scenarios have very different performance:
var map = {a: 0}; # Case A
map.a = 'a';
var map = {}; # Case B
map.a = 'a';
var map = { a: 'a' }; # Case C
map.a = 'a';
Even though the result is identical, case A (!) is fastest,
closely followed by C, with B coming at a serious distance.
Case A appears to have gotten worse from Chrome 37 to 40.
With other engines, the performance of all cases is highly similar:
http://jsperf.com/unknown-hash-key/2
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