Runtime performance. This is mostly an LLVM versus GCC thing.
Runtime performance is far more important to us than compiler speed—a fast-to-compile Web browser is useless if it loses to existing engines in UX or benchmarks (every cycle counts!)—but we continue to spend time on compiler speed, because it's important for developers.
Runtime performance is far more important to us than compiler speed—a fast-to-compile Web browser is useless if it loses to existing engines in UX or benchmarks (every cycle counts!)—but we continue to spend time on compiler speed, because it's important for developers.