When coming from Geth, be aware that the
--geth option provides you with the highest degree of compatibility to Geth’s behaviour, even at the cost of speed, security, functionality and standardisation.
If you don’t care about historical transaction information, just use our state-snapshotting to get synced really fast.
On 1.2 and above, use Geth’s export feature along with Parity’s import:
mkfifo /tmp/chain.rlp && geth export /tmp/chain.rlp & sleep 1 && parity import /tmp/chain.rlp