Have couple of issues to look regarding the plugin:
1) Hummingbirds Gzip compression is working partially, only text/html appears disabled, rest is working correctly.
2) Once Asset Optimziation is enabled under Hummingbird > Asset Optimzation. The files aren't getting minified on checking the source code. All the files doesnt get minified.
3) 3 images are still showing as not optimized under Performance Test in the plugin. Looking to optimze the remaining images.
Please check the chat notes for more info.