Yahoo! Weather Report; Crawler Changes
Yahoo! has been busy this week rolling out updates to its crawl, index and ranking systems which are "relatively significant" for webmasters:
Priyank Garg posts on the Yahoo Search Blog:
We’re reducing our crawling machines by a significant amount with this update, so you might have observed a significant reduction in crawl load from us along with fewer machine IP addresses hitting you over the last few days.
The new crawler continues to improve comprehensiveness and freshness of coverage while also enhancing crawl efficiency, which reduces spurious load on websites.