Because the systems of local music and QQ Music are different.

The song playback speeds of the two softwares may be due to different systems. If the systems do not cooperate successfully, the local music transfer to QQ Music will slow down.

The way to import local music into QQ Music is to open the music on our computer, enter the main interface, click Local and Download, and select Add. After clicking Add, you will see that there are two ways to import local songs: manual adding of songs and automatic scanning and monitoring. Here, click Manually Add Songs. Select the local songs you want to import and press the shift key to import them in batches. You can see that multiple songs have been imported. We can also choose automatic scan monitoring to import songs. After selecting the automatically scanned folder, we can import it directly.