Hi Ommid, welcome to CDFreaks!
No, all optical drives and media are limited in how fast they can spin, so the maximum burning speed is limited by the maximum rotational speed.
When the discs spins as fast as it can, the burn will look like your graph above and is called Constant Angular Velocity (CAV) burn. It doesn’t get any faster than that, unless the drive can sustain a faster rotational speed like e.g. a 20x drive. Even such a drive will show the same type of graph, only starting at about 8x and ending at 20x.
There are some 16x P-CAV burners which start the burn with higher rotational speed and reach 16x before the end of the disc, but your drive cannot do that with a 16x burn (it can do it with 12x burns on 16x rated media however).