Parity passive basically lets you to fine tune the way how active your node is. This can be due to multiple reasons:
- energy consumption of IoT devices (less CPU cycles, etc.)
- bandwidth consumption on mobile connections (less tx-forwarding, etc.)
To understand the power of that configuration options, also have a look at
Set the operating mode. MODE can be one of:
last - Uses the last-used mode, active if none.
active - Parity continuously syncs the chain.
passive - Parity syncs initially, then sleeps and wakes regularly to resync.
dark - Parity syncs only when the RPC is active.
offline - Parity doesn't sync. (default: last)
Specify the number of seconds before inactivity timeout occurs when mode is dark or passive (default: 300)
Specify the number of seconds before auto sleep reawake timeout occurs when mode is passive (default: 3600)
Which gives you full control beyond the default configuration options.