At the risk of going off topic, a question about sampling and sampling rates. If I set sampling to 1%, will the visitor totals in the Google Analytics dashboards reflect 1% of my true values or do they compensate/extrapolate out to 100% based on the sampling rate?
There are two things here. Sampling rate for calculating page timing and using sampled data when generating reports. Confusingly, they are two different things with the same word "sample."
However, to speed up ad-hoc querying, like when you create a custom report, it will limit the amount of data it will fetch to generate that report in order to make the user interface faster.
You can increase/decrease that using the slider. YOu will only see the slider after something like 250k unique pageviews.
Google Analytics Premium increases the number. If you really want to get a better sense of page timing, you should look both at the client side timing and the server side timing together. All you can really control is stuff going out. You can't help it if the user is running a netbook with 512 megs of RAM :)
