For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
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As is typical, Apple hasn't officially confirmed what products will be released at the event, but rumors point to three very specific possibilities: an iPhone 17e, a new iPad Air, and new MacBooks. For the MacBooks, rumor has it Apple will be releasing a souped-up MacBook Pro with a new M5 Pro chip, a budget MacBook with a touchscreen display, or both, or neither. A more affordable MacBook could completely tip the balance of the budget laptop market in Apple's favor, and if I made Windows laptops, I'd be worried right now.