We have some machines at BAE that rip though titanium and absolutly mad rates, you can't see the cutter for a cloud of chips. These used to be cut with coolant, literally gallons per second flooded at high pressure to cool and remove the chips
However some years ago they moved to tooling that cuts dry and the feed rates are insane, however I recal this was for roughing out only, and the finish cuts are still done under flood coolant, likely to be for surface finish and crack protection

Paul