Epic Games and Mozilla
show off how well the Unreal Engine 4 runs in Firefox, without the use of any plug-ins. Mozilla explains on its blog that they've made big improvements in the performance of web applications using asm.js. In the last 12 months they've increased the performance from 40 percent to within 67 percent of native, and they expect it to get even faster.
“This technology has reached a point where games users can jump into via a Web link are now almost indistinguishable from ones they might have had to wait to download and install,” said Brendan Eich, CTO and SVP of Engineering at Mozilla. “Using Emscripten to cross-compile C and C++ into asm.js, developers can run their games at near-native speeds, so they can approach the Web as they would any other platform.”