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Apple Disables WebKit's JIT in Lockdown Mode
To put it in Steven Sinofsky’s terms, gatekeeping is a fundamental aspect of Apple’s brand promise with iOS.
Lours’s benchmarking indicated roughly a two-third reduction in JavaScript performance with Lockdown Mode enabled in Speedometer. This brings me to BrowserEngineKit, a new framework Apple created specifically for compliance with the EU’s DMA, which requires gatekeeping platforms to allow for third-party browser engines. However, as browser engines are constantly exposed to untrusted and potentially malicious content and have visibility of sensitive user data, they are one of the most common attack vectors for bad actors.
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