Whether the car's boost is fast or not, which indicator is the main thing to look at?

Directly look at the torque, but often the engine displacement, power, or whether or not it is turbocharged determines the amount of torque.

Besides that, the weight of the car also directly determines the car's speed performance.

The tuning of the car and the transmission mode also determine the boost.

The shape of the vehicle and the tires have a microscopic effect on the speed of the vehicle.

There are also external causes such as road surface and wind resistance.

In short, a car's boost performance and top speed performance are a contradiction in terms, but their ultimate root cause is - engine power, weight.