The brochure of su30sm had already said that the su30sm’s maximum speed is only 1,320km/h at sea level(1.08 mach).If we multiply by 1.1,then it’s still only 1458km/h(1.19 mach).
But in War Thunder,it can fly to 1510km/h(1.23 mach),the speed and engine power should be reduced.
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At altitude it should be 1.75 according to rosoboronexport
Maybe just not done yet