The throttle of the car is too heavy. What is the reason?

There are two possibilities. One is that the clutch design is like this. The clutch is heavy when the car leaves the factory. Some cars will. This is not a broken car, it is an innate design, that's all.

The second possibility is that the clutch wire is short of oil and a little stuck. So it feels heavy to step on it Steel wire can be relieved after lubrication.