Does running bitcoind with -prune option make the initial blockchain
sync faster or not?
No, it just allows you to define the maximum storage space for old blocks to use, but it will still download all of the blocks to verify them, deleting them afterwards.
Reduce storage requirements by enabling pruning (deleting) of old
blocks. This allows the pruneblockchain RPC to be called to
delete specific blocks, and enables automatic pruning of old
blocks if a target size in MiB is provided. This mode is
incompatible with -txindex and -rescan. Warning: Reverting this
setting requires re-downloading the entire blockchain. (default:
0 = disable pruning blocks, 1 = allow manual pruning via RPC,
>=550 = automatically prune block files to stay under the
specified target size in MiB)
To reduce the sync time you could use the
-assumevalid flag to move the default assumed valid block to a later block, but obviously this is a risk you take.
If this block is in the chain assume that it and its ancestors are valid
and potentially skip their script verification (0 to verify all,