Do you not understand how file systems work? This is pure logic, no need for any experiment or benchmark. Fragmented files require reading more blocks. The ex

Do you not understand how file systems work? This is pure logic, no need for any experiment or benchmark. Fragmented files require reading more blocks. The exact scheme depends on the filesystem used. The 30% figure came from an estimation of the ext4 worst case vs best case of number of reads needed.