+ a built in browser monitor download page.
bootstrap.compete in your css file the whole framework, if you have on the page is used, for example, only grid, with the tochi optimizer the rest of the code superfluous, and for this page it is not needed.
The same goes for style.css and js . After completion, they should be beneficiality ( grunt or manually). This will also give the increase.
Image you can easily reap up to 75% quality JPG, if they do not represent artistic value, the difference is minimal.
gzip is a server's ability to respond to your request in the archive - will it make a noticeable effect - you need to try and watch