Afaik there’s no real performance test available (what exactly do you want to check?), but you can find a plugin that came out of the first Q below, that might help you doing some profilling.
An interesting read might be…
- refactoring WP to improve memory performance
- generally a lot of Qs inside the performance tag
Also: You can use the Debug Bar Plugin:
(source: wordpress.org)
…or if it’s about plugin performance, try to take a look via the P3 Plugin Performance Profiler Plugin. No need to run this on multiple sites, as it meassures in %-values.
