"cannot speed up" is grammatically correct and can be used in written English.
Example: "The aging process is natural and cannot be sped up, so it's important to take care of your health and well-being."
If the provider cannot speed up a slow connection, a user might want to make a switch.
No matter how much you want to know the answer, you cannot speed up time; you will not know until the college releases their decisions.
If the Senate cannot speed up its usual process for debating bills, the chamber will not be able vote until Friday morning.
Marchionne says Chrysler cannot speed up the introduction of its new vehicles without risking product quality.
When node speed increases to a certain value, frequent change of neighbor nodes cannot speed up virus spreading.
While the wheels are spinning, the driving force on the tires reduces considerably and the vehicle cannot speed up as desired.
But work is always linear — you cannot give more hours than there are in a day, you cannot exponentially speed up your learning, your content creation or your software development.
Once significant grain coalescence has been triggered, further increase in the heat generation cannot significantly speed up the process due to the limited volume of the Sn grains, thereby causing the saturation region (Fig. 4b).
Accordingly, social institutions and their component organisations are like very large ocean liners that cannot slow down, speed up, or change direction very easily.
Neutrons cannot be speeded up in an accelerator because they have no electric charge to grab hold of.
When it is necessary to grow microbes in the laboratory, the process cannot be speeded up, Dr. Kop lan said.
