> Perhaps you made some other change. I tried with both global remove and remove on the Array prototype. V8 has recently improved DeltaBlue score by, I think,

> Perhaps you made some other change. I tried with both global remove and remove on the Array prototype. V8 has recently improved DeltaBlue score by, I think, ~6% so it can be that before this improvement OrderedCollection overhead was more noticeable. (some of that improvement comes from tweaks in the inlining heuristics AFAIK). > There are 3 benchmarks. I was stating performance numbers for DeltaBlue only. Sorry for not being clear. > How can dart2js results be compared to the original JS if the data structures used are different? Substract 5%. dart2js is around 95%. Does it make sense now?