<ul><li>The first iOS & iPadOS 18.4 developer beta 1 appears to lock down JIT capabilities to the debugger only.</li><li>JIT (Just In Time compilation) allows sideloaded apps like game emulators to run better on iPhones and iPads.</li><li>Apple's decision to interfere with normal JIT enablement affects sideloaded apps on iOS or iPadOS 18.4 and later.</li><li>While sideloaded emulator apps that utilized JIT will remain usable, they may experience worse performance without JIT.</li></ul>

iOS 18.4 appears to interfere with JIT compilation in sideloaded apps

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