Seattle, May 1 -- A frenzied day of earnings reports offered a glimpse at how some of the world's biggest tech companies are doing in artificial intelligence. The upshot: Alphabet Inc.'s Google is seeing a clear payoff from its AI spending, while Meta Platforms Inc. is lagging behind. The two companies' results were part of a flood of financial information Wednesday, when Alphabet, Meta, Amazon.com Inc. and Microsoft Corp. all delivered their numbers within the span of two minutes. The four companies are the largest spenders on AI data farms, putting them at the centre of an infrastructure build-out that's expected to cost trillions of dollars. Meta and Alphabet both tacked on another $10 billion to their budget - taking the quartet's total...