Distribution method of the compressed JS and CSS files to the client device. Different methods perform better on different server setup: 'Direct' method distributes them in the default method of the webserver (like any other files), but note that gzip compression and caching may be disabled (i.e. those are controlled by the webserver and PSN is not able to affect the settings nor to check is they are currently enabled or not.) 'Apache mod_rewrite + mod_headers' is the fastest method, but requires Apache with both mod_rewrite and mod_headers modules enabled. 'Apache mod_rewrite' and 'PHP' are identical from the performance point of view; the only difference is that 'Apache mod_rewrite' requires Apache webserver, while 'PHP' generates not-so-beautiful URLs like /s/get.php?abcdef.js instead of just /s/abcdef.js.