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I am running a single test (FirefoxDriveR)which visits all links on a given domain.
OS: Ubuntu 9.10
Memory: 4GB
HD: 500GB
10 mbp/s line
Observing the following via command TOP
11001 hudson 20 0 508m 108m 28m S 64 2.8 2:31.58 firefox-bin
10937 hudson 20 0 1277m 73m 9772 S 6 1.8 0:21.93 java
10929 hudson 20 0 43820 10m 3440 S 3 0.3 0:06.25 Xvnc
64% CPU Consumption via firefox-bin. Anyway I can reduce this ?
On a 3Ghz machine, I see firefox using in the range from 25-40% CPU when running at full blast through a site. Remember that firefox is effectively an execution environment for code. So page efficiency corrolates to CPU usage on the host.
Standard tricks for optimizing javascript, css and page rendering apply here, this is not about webdriver as such, although you can expect a baseline for reasonably efficient pages around 30%