[BUG] Too slow to load first song

[airon90]

To Reproduce Steps to reproduce the behavior:

1. Have a lot of songs in the library (actually I have 2177 songs)
2. Click on a song in a library to play
3. Wait for 20 seconds before app starts loading the song. Sometimes a freeze warning pops out

Information:

• Device: Xiaomi Redmi Note 8T
• Android version: MIUI EU 12.5.2
• Music version: F-Droid latest

Additional context log.txt

[z-huang]

The player will first fetch all songs into the playing queue, that's why it's slow. A lazy load measure should be taken.