Apple's WebKit performance tax leaves iOS browsers stuck in the slow lane, says Microsoft

Critics and competitors have long complained about the "Apple Tax" – the sales commission developers are obliged to pay on App Store sales and in-app purchases. Now Microsoft engineers have documented a performance tax – the performance hit that iOS users today endure because Apple requires iOS browsers, with theoretical exceptions, to use the WebKit browser engine that powers Safari. The performance tax comes to 28.6 percent, almost as much as Apple's 30 percent commission rate. Bro