I'm quite disappointed in Hummingbird's performance tests and reporting. I'm seeing similar things on numerous sites and it creates unnecessary concern for clients, and frankly is just wrong.
The first issue is the absolutely stupid percentage calculations for performance test results. For example, on this particular site I have scores of between 96 - 100 for all except "Improve Server Response Time", which according to Hummingbird is 79, then "Optimise Images" supposedly scores 29, telling me there are 7 images that aren't compressed - out of a total of nearly 370 images on the site, yet Smush Pro tells me ALL images have been Smushed, then it tells me there are 8 images which need resizing. So there are a total of 15 images out of nearly 370 that Hummingbird believes aren't optimised, 7 of which Smush Pro believes ARE optimised, and somehow this equates to a ludicrous score of 29% for image optimisation? Those two elements then impact the total performance score of the site massively, dragging it down to 64/100, which is just stupid.
I have enabled support access on this site and I needn't remind you that this is a LIVE client site, so I expect it to be handled as such. I'm unconcerned for this particular ticket about the "Server Response Time" issue, only the images and the obvious issues with Hummingbird and / or Smush Pro.
For the reports and Performance Score to be taken seriously, these issues need to be corrected.