Low speed on x86_64-unknown-linux-musl

[DeadNumbers]

Why so different speed for some targets? For x86_64-unknown-linux-gnu

./target/release/walk    
Time elapsed: 1.022172369s
Found 11 files

and x7 slow for x86_64-unknown-linux-musl

./target/x86_64-unknown-linux-musl/release/walk
Time elapsed: 7.560947213s
Found 11 files

Why?