[mraleph]

> it's awfully hard to "submit a bug report and pray,"

You don't need to be praying. If no immediate fix can be made in the V8, you will get some recommendations and explanations based on the V8 team knowledge.

I would go as far as saying that bug reports like this are a single most reliable signal of what JS developers want to be fast on the web. By not reporting performance issues and silently working around them you hinder this signal. THere might be bugs and inconsistencies in underlying VM optimizations that can go unnoticed for a long time due to that.