To enable Gears click the Gears link on the top right of the screen and follow the instructions. If your browser does not have Gears installed you will be provided a link to install the library. A demonstration of this functionality is given in the video below. There is not much to see, but the performance improvement is noticeable if you use Webmin a lot.
The concept and initial code for this functionality was kindly provided by Dwi Kristianto. I have integrated his proposal into the core StressFree theme and in the process tweaked it a fair bit to ensure it works in a variety of Webmin configurations.
This release also fixes a login screen rendering bug introduced since version 1.450 of Webmin. Unfortunately to resolve this bug backwards compatibility with Webmin versions > 1.450 is broken. If you are not using Webmin 1.450+ it is recommended that you do not install this theme, or better yet, upgrade Webmin prior to installing this theme.
The updated theme can be downloaded from here.