http://en.wikipedia.org/wiki/Symbolic_link

Although storing the link value inside the inode saves a disk block and a 
disk read, the operating system still needs to parse the pathname 
information in the link, which always requires reading an additional inode 
and generally requires reading other — potentially many — directories, 
processing both the list of files and the inodes of each of them until it 
finds a match with the link pathname components. Only when a link points to 
a file inside the same directory do fast symlinks provide significant gains 
in performance.

Jei cia teisybe yr, taip iseina kad ant  dideles apkrovos nelebai verta 
naudot, resuarsu svaistyma gaunas.