[arghwhat]

A lot of browser memory consumption comes with overheads from their multi-process models.

However, that aside, it makes no difference whether you have a window, tab, or "space".

[dleslie]

The multi process model was an improvement. In days past browsers were single process, and suffered from:

- JavaScript on one page dragging down all tabs

- Memory leaks

- JavaScript exploits that crossed tabs

And so on.

Multi process browsing is fantastic.

[arghwhat]

We still have all but the first issue, and that one has nothing to do with multi-process browsing, just multi-threaded processing.

So all we really won was performance regressions (the IPC is expensive) and significantly increased resource consumption.