Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
James Richardson。同城约会对此有专业解读
ВсеИнтернетКиберпреступностьCoцсетиМемыРекламаПрессаТВ и радиоФактчекинг，这一点在safew官方版本下载中也有详细论述
Brazil GP — March 22