As a Wordpress Rookie can you tell me how I can analyse the response time of the server and specific how the Plugins are doing. You mention in Hummingbird to install the plugin P3 but this one has not been updated for more then a year and seeing the recent reactions it is not wise to install (so can you advise me an alternative plugin or solution)
Here below the copy paste text out Hummingbird (which I would advise to remove and replace by some better recommendation):
Usually your installed WordPress plugins have the greatest impact on your page generation time. Some are horribly inefficient, and some are just resource intensive. Test the performance impact of your plugins using the P3 plugin, then remove the worst offenders, or replace them with a suitable alternative.