It's just an experiment to examine how much time it takes for PHP to traverse over many files.
no | short (1) [ms] | long (10) [ms] | extralong (100) [ms]
------------------------------------------------------------------------
1 | 6 | 8 | 23
2 | 11 | 15 | 27
3 | 6 | 7 | 22
4 | 7 | 8 | 23
5 | 6 | 8 | 29
6 | 7 | 11 | 23
7 | 7 | 9 | 31
8 | 7 | 8 | 23
9 | 7 | 8 | 23
10 | 6 | 7 | 24
11 | 7 | 14 | 24
12 | 6 | 7 | 27
13 | 6 | 22 | 23
14 | 6 | 7 | 23
15 | 6 | 7 | 22
16 | 11 | 12 | 23
------------------------------------------------------------------------
Mean: 7 | 9.875 | 24.375
Median: 6.5 | 8 | 23
More details you can find in Polish on: http://szalonypecet.pl/2018/10/21/czy-korzystanie-ze-wzorcow-projektowych-spowalnia-dzialanie-programu/