DeeCee - 3:08 am on Mar 6, 2012 (gmt 0)
See my earlier reply on why those caches have little to no impact, other than slowing them down even further by introcing a two-step process to get to actual web-pages..
Caches only work to speed things up on web-pages that are loaded over and over by many. A first load will always be slower than loading directly from the original source.
All the mobile phones I see access my sites directly.
Almost all the cache calls I see from Yahoo do not bother to load all pieces, but merely the text. It is a scam.
As an example, last night I moved a site to a new domain (only less than two hours old or so after registration), and the YahooCacheSystem came by immediately and started lifting text (only text, no CSS, JS, or images). Not through the 301 redirect from the old location, but directly going for the new domain which could ONLY have been found by an information tracker that follows new domains created and start lifting information.