GLBenchmark is an OpenGL ES 2.0 benchmark with a number of performance metrics incorporated within. We specifically used the Fill Texture Fetch suite to measure raw texture fill rate of a graphics core and the Egypt Off Screen test to measure 3D performance in frames per second. The Off Screen test renders workloads at 1280x720 for all devices, but off-screen, so Vsynch and screen refresh are not limiting performance.
The Nexus 7 performed well in both of the GLBenchmark tests (Egypt Off Screen and Fill Texture Fetch). Although it didn't earn the No. 1 spot, it wasn't far behind in either of these tests.
An3DBench XL is a benchmarking tool based on an Android port of the jPCT 3D engine. The app runs 7 tests in total that look at graphics processor fill rate and complex rendering workloads and scenes.
If you notice, many of today's top tablets in the An3DBench XL test are neck-and-neck. The Nexus 7 may not have earned the top spot, but it's right up there with all of today's popular tablets in terms of benchmark scores on the An3DBench XL test.