Expensive, and it's not clear that it would help. Context switching between applications is costly in terms of cache hit and CPU time. The other problem is yo

Expensive, and it's not clear that it would help. Context switching between applications is costly in terms of cache hit and CPU time. The other problem is you then have to IPC the sensitive data to the other process, which will mean putting in temporary memory, which would expose it to stack crash, or heap attacks. You've also got to worry about synchronizing the different processes.