Opening a new tab of the application takes about 50 mb of memory. That is a lot.
Even worse, when entering a new page there is a memory leak, of about 200 kb:

The memory footprint for the system seems even higher. If a open a tab, click a few times, leave it open for 5 minutes, i can free up about 200 mb by closing the tab. This morning after 20 minutes of running it in a few tabs, it aggregated about 6GB, but I've not yet established exactly why.