It's not obvious (at least to me) that Meltdown is caused by a performance optimization. The fix to Meltdown introduces a pessimization, sure, but that's not ne

It's not obvious (at least to me) that Meltdown is caused by a performance optimization. The fix to Meltdown introduces a pessimization, sure, but that's not necessarily the same thing. Meltdown could be a simple bug that doesn't incur a perf loss when designed for properly, but happens to require an expensive fix in the field. Does anyone know?