Hermit’s new Data Saver mode helps you minimize the amount of data sent to your device and thus reduces your Internet costs when connecting to sites that support Data Saver mode.
Data Saver mode can set individually for each Lite App. You can turn it on for some Lite Apps and leave it off for some. This gives you more control over the sites for which you would like to see the full experience and those for which you would like to see a reduced-data-consumption experience.
In any Lite App, open the left menu (tap on the ☰ icon), then tap on Customize. Under Behavior, you will see the Data Saver option.
Data Saver in Hermit works by asking the source server to send you a smaller page. Some sites respect that and send you a smaller page, and other sites completely ignore that. This is a fairly new protocol, so not many sites support it today, but it works for SSL as well as non-SSL (insecure web sites).
To be clear, Hermit does not intercept your Internet traffic or compress any data server-side. It only asks the server to send you a smaller page. If the server doesn’t support Data Saver mode, you will not see any benefits from it.
Want to read up on the technical details? Here you go: Delivering Fast and Light Applications with Save-Data
Hermit behaves exactly the same way as Chrome for SSL web sites. If you used Facebook or Twitter in Chrome, it would have consumed exactly as much data as Hermit, no more, no less, because they are both SSL by default. That is because Hermit uses the Chrome-based Android WebView component for rendering.
In addition to this, Chrome has a second Data Saver mode that is more aggressive, but only applies to non-secure web sites. For such sites, Chrome redirects all your Internet traffic through Google’s servers, which compress the pages and send them back to Chrome.
However, since so many sites today are encrypted, and more sites are being encrypted every day, the benefits of this approach are fast dwindling. Hermit does not support this mode, and does not send any of your Internet traffic to other servers.
There is an option in Hermit to turn off all images — that will really help you reduce the data you are using. Launch Hermit, then tap on the three lines in the top-left corner, ☰, then tap on Settings and turn off Load images.