The latest SILK wallet is horrible slow when syncing, it downloads exactly 500 blocks and then pauses for dozens of seconds while complaining about failed proof-of-stake.
received block 56020c841287f7d131b9
SetBestChain: new best=56020c841287f7d131b9 height=147500 trust=21706937481816350 blocktrust=9292773 date=08/05/14 00:23:01
ProcessBlock: ACCEPTED
received block 7411b2bb401d25735ade
ERROR: CheckProofOfStake() : INFO: read txPrev failed
WARNING: ProcessBlock(): check proof-of-stake failed for block 7411b2bb401d25735ade355288fa10332323a3f881868a8a5d9c59e74fef7aad
...
received block 701def8ff6beba21d360
ERROR: CheckProofOfStake() : INFO: read txPrev failed
WARNING: ProcessBlock(): check proof-of-stake failed for block 701def8ff6beba21d36024bf359019473c14ed5c5bbcfecdec38df8806af8bb2
received block b1a874b27dff59962bef
SetBestChain: new best=b1a874b27dff59962bef height=147501 trust=21706937487320788 blocktrust=5504438 date=08/05/14 00:16:22
ProcessBlock: ACCEPTED