SEM Wired

Page loading time is a crucial factor when it comes to estimate page’s usability as well as search engine’s rankings and Google’s Adwords quality score.

according to this statement, Google is going to update its assessment policy . Page load time it is soon due to become an important factor requiring specific assessment and optimization from webmasters and SEOs.

In order to calculate page loading time, you might try Pingdom. Pingdom is an online utility which calculates pages text, images and scripts, giving you also some interesting suggestions about improvement.

However, besides any Google statement about quality score or rankings, it’s always good to think about you user’s experience on your website: nobody likes websites taking too long to load.

Considering both usability and rankings, this should be some general guidelines to be followed one assessing and optimizing page’s loading time:

Text and page structure should load and be completely visible within the first 3 seconds
Any other element of the page must be visible within the first 8 seconds

These are only thumb rules of course. Always cehck your page weight and loading times. Working on this side of on-page optimization can lead to interesting discoveries sometimes.