IMHO, basically money & talent. Google hires the best and pours money into V8. The very best developers can work full time and without any distractions. Also, Google is personally invested in making Chrome fast. Not to mention the vast sea of developers Google has and can throw at any project.
Other languages struggle in this regard. Comparatively I imagine far fewer developers working full time on Ruby/Python, not to mention they would have budget constraints to hire and retain talent.
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IMHO, basically money & talent. Google hires the best and pours money into V8. The very best developers can work full time and without any distractions. Also, Google is personally invested in making Chrome fast. Not to mention the vast sea of developers Google has and can throw at any project.
Other languages struggle in this regard. Comparatively I imagine far fewer developers working full time on Ruby/Python, not to mention they would have budget constraints to hire and retain talent.