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The Sparkplug compiler sits between V8's Ignition bytecode interpreter and the TurboFan optimizing compiler.
Microsoft is also claiming major performance improvements with its Chromium-based Edge 91 release. At its developer conference, it highlighted the 'startup boost' feature for faster page loads and sleeping tabs to drastically cut memory usage. With yesterday's release of Edge 91, Microsoft now claims Edge is "the best performing browser on Windows 10."