The first test, '2.7 T-Rex HD Offscreen', takes devices to their limits to test their graphics performance and the Nexus 5 came away with a score of 23.1fps.
To put that into perspective, that's an identical score to the
Sony Xperia Z1, substantially higher than the
Samsung Galaxy S4 (which averaged 17.2fps) and only marginally worse than the
iPhone 5S, which completed the test with an average score of 24.7fps.
The other test that the Nexus 5 has completed is '2.5 Egypt HD Offscreen'. As with the first benchmark, it tests the phones graphics capabilities, but it's not quite so intensive.
That's highlighted in the 59.2fps score the Nexus 5 received, which topped the Samsung Galaxy S4's score of 43.9fps and even the iPhone 5S, which managed 56.7fps. Though it did marginally worse on this test than the Sony Xperia Z1, which scored 60.6fps.