Overclocking is the easiest way to improve overall performance on Google Nexus 7. NVIDIA Tegra 3 Super 4-PLUS-1 Quad Core CPU is clocked at 1.3 GHz by default on Nexus 7. However, you still can push its limit and improve overall Nexus 7 performance by overclock up to 1.7 GHz. Official Nexus 7 kernel does not support overclock feature. So you need to install custom kernel for Nexus 7 in order to overclock.
Note – overclock will reduce NVIDIA Tegra 3 CPU, GeForce GPU and other hardware components lifespan because it will overheat easily. Do it at your own risk.