Apple tried to address this problem by introducing a new benchmark suite that aims to combine latency and throughput benchmarks with roughly equal weighting, the JetStream benchmark suite. It contains benchmarks from both SunSpider and Octane, but also additional interesting benchmarks, like various Emscripten compiled C/C++ programs.
So JetStream seems to be a good candidate to measure our progress on improving overall performance of Chrome/V8 (considering both throughput and latency). As you can see from the chart below, we have been doing well pretty lately. Chrome 44 (current canary build) beats both Firefox and Safari, and we're working on reducing the latency further for the next release. The numbers were measured on a MacBook Pro (Mid 2012 / 2.3 GHz Intel Core i7 / 16 GB) running OS X 10.9.5.