WebAssembly, the portable binary format for improving web application performance, is being tweaked by Microsoft for its Edge browser.

With the browser featured in the recent Windows 10 Creators Update, the Chakra JavaScript engine defers parsing WebAssembly functions until called; other engines parse functions at start time.

"We've observed startup time as a major headache for large web apps and have rarely seen runtime performance being the issue from our experiences with existing WebAssembly and asm.js workloads," said Limin Zhu, program manager for the Chakra team at Microsoft, this week. "As a result, a WebAssembly app often loads noticeably faster in Microsoft Edge."

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