It's a marathon, not a sprint.
As our multimedia applications benchmarks aren't designed for Chrome OS, we weren't able to test performance in the same way that we would test a Windows-based laptop. Instead, we used the browser-based SunSpider JavaScript benchmark; results are measured in milliseconds, so lower numbers represent better performance. An overall score of 1496 looks incredibly poor compared to a desktop PC, which will score around 250, but compared to a BlackBerry Playbook, which scored 2349ms and an iPhone 4 which scored 4153ms, it is certainly faster than a tablet or smartphone.
Happily, even when running 720p video, fan noise and heat stayed at a minimum.
We also had to test battery life differently; instead of using our usual light-use benchmark (which currently only runs on Windows or MacOS X), we timed how long it could play an MP3 file on a constant loop before it ran out of power. We made sure it stayed connected to the internet, as Chrome OS essentially becomes unusable when disconnected, but it still managed a lengthy eleven and a half hours away from the mains which is in line with what we'd expect from a modern Atom-based netbook. Of course, this is somewhat redundant if you take it on the move but don't have access to the internet.
The integrated graphics chip is supposed to be able to handle 720p high definition video, but locally stored 720p files won't play smoothly unless all browser windows are closed. YouTube 720p content encoded in H.264 played reasonably well, but there were lots of pixellation artefacts. Adobe Flash is supported natively, but HD streams on BBC iPlayer were juddery, with far too many dropped frames to be enjoyable. Happily, even when running 720p video, fan noise and heat stayed at a minimum.
