I'm on a capped internet connection and need to limit my bandwidth usage as much as possible.<p>In the old days, that meant installing a transparent proxy using Squid.
If you don't already use one, install an adblocker such as µblock.<p>You could disable JavaScript too, but I don't think the web is usable without it.<p>You could also investigate Opera Mini, I think they download and compress the web-pages before sending them to you (however they have access to all your history, nothing is free in this world).