Hi there, thanks for reaching out. We work hard to try to make the fastest browser we can.
It’s always difficult to make a browser that is both fast and light on CPU/RAM resources. Usually to make the things faster you end up cahcing more which in turn leads to using up more RAM. We have tried to find a balance automatically but you can modify some of the settings for tab suspension here secure://settings/performanceAdvanced
Suspending tabs is one of the most efficient ways to free up RAM so if you want to save more space you can reduce the time period before a tab is suspended. Hopefully this helps