: Google Webmaster Tools - Why site performance graph goes up and down, even if the site has never changed? This is my site 7 months graph from Google Webmaster Tools site performance util.

@Alves908

the results depends on the server up/down time and website traffic also. If you are on a shared hosting you may see high number of fluctuations in the graph.

If you are in shared hosting and your site faced with high traffic then you website might get slow performance.

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@Sarah324

This shouldn't be a surprise. Unless you live in a world where everything is a constant this will fluctuate. Some of the variables include:


If the server is experiencing higher load it will be slower then when it is not
If your site is experiencing more traffic at that moment it may be slower
If any part of the network between you and Googlebot is slower or faster it will affect Googlebots perceived performance
Different pages will perform differently. An optimized page will perform better then an unoptimized one. This data "shows you the average page load time for pages in your site [...] collected directly from users who have installed the Google Toolbar." [docs]
A lot of the factors above can be influenced by the time of day. During peak hours servers and networks will be slower then during off-peak hours.


This is why CDNs are so darn handy for site performance. You aren't so dependent on one point of service for everything.

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