The speed of your storage device probably has more to do than the speed of your processor when reading the meta data from the file.
A recent machine I built has a Samsung 980 PRO PCle 4.0 NVMe M.2 drive mounted to the motherboard and it can easily catalogue 30,000 music files in < 5 seconds.
A similar machine with the files stored on a SATA Drive (spinning Disc and SSD) this would take about 1 Minute. It would be incredibly slower of it was a USB attached storage.
As the meta data for the music files is stored in a database you don't need to scan the catalogue every time you start up.
You can disable 'Check for music updates on Startup" within the MusicCentre Admin.
If you do this you can then scan the music files only when you make changes. This will help with the load times.
Unfortunately this does not work for Music Videos as the meta data is not stored in a database (I wish it was then we could have a proper search engine).