"Helper" processes using up insane RAM amounts
With many of these 'multi-page' applications like web browsers, each open tab or window gets its own 'helper' app, which supports that open web page.

The only way to clear them is to close unused tabs.

For such as Steam or Unity, the helper app will be the one actually supporting &amp; running the loaded game etc. The 'face' app/portal will just be running itself.

Example of 'greedy' web browser in action... The 'total' figure shown for Safari itself does not include the other sub-process below, they are in addition to Safari's own memory usage.