CPU (frequency and cache [compared with the same model]), memory (model and size), hard disk (speed and cache).

2. Software.

System optimization. (Whether many useless [or temporarily unused] service processes or programs running in the background are loaded). The proportion of fragments on the hard disk. There are also fragments in the registry. The size of the virtual memory.

In general, the hardware is not easy to change casually, and the main factor affecting the speed is the optimization of the system. If garbage and debris can be removed regularly and the system can be optimized effectively, the speed can be obviously improved.