Caching

What percentage of site traffic never gets there?

[cornwall]

Let me start by saying "I believe in caching being a good thing"

However I am trying to get at an estimate of how big caching really is

Having spent several hours with Google searching I came up with a couple of articles
[internetnews.com...]
and
[pint.com...]

The distilled wisdom would appear to be in

For instance, according ABCi, caching and Web spider activity can cause logfile figures to be as much as 30 percent off, if publishers aren't using one of the major analysis or auditing services. (Jupiter, similarly, reports that caching can underreport site hits by as much as 45 percent.)

there is another commercial reference
[bellacoola.com...]
which suggests 40% for cached traffic

Question - does the figure of around 30% to 40% for cached traffic sound reasonable?

Question - Does anyone have a better idea or source?

[cornwall]

And... the reference to the ABCi figure is

[abcinteractiveaudits.com...]

Which is clearly written for a tech article :)

[Brett_Tabke]

Depends on the type of your site. If it is "cacheable" site, then yes, I could see 30-40% not showing up in log files.

However, caches don't cache near what they used to since the widespread adoption of the repressive HTTP 1.1 specification on caching. It rewrote the rules of caching into a confusing cluster of obtuse and often contradictroy rules.