Ok - I just did a simplistic benchmark timing this particular method when loading 571 untagged music files.

On master branch timings were (in ms) 127, 144, 152, 166
On this branch timings were 192, 142, 139, 147

Repeat run, master: 125, 155, 148, 148
On this branch: 123, 143, 150, 151

Within the margin of measurement error, there does not appear to be any significant difference.