DCNS envision the SMX-25 to be powered by three gas turbines driving three water jets and submersible is designed to achieve a sustained surface speed of 38 knots. Despite the fact that the SMX-25 can deploy very quickly, it is essentially a conventional submarine. On reaching its designated patrol area, the SMX-25 will operate like other submarines using the same types of sensors and resources.
According to aviationweek: Non-nuclear submarines cannot typically operate fast for long run: current generation batteries do not store enough energy and their circular-section hulls are not considered to be very efficient when operating on the surface of the water and they are typically limited to about 10 knots. The SMX-25 is on the other hand is designed for high speed on the surface, with a wave-piercing hull and a top speed of 38 knots and a range of about 8000 nm. According to DCNS it will be hard to detect via sonar and radar and hard to hit by missiles (as it has a low signature and can also dive to evade the missile) and also hard to destroy using a torpedo because of its fast speed.