[DCP-o-matic] Encoding servers: error during async_read

Got 1G lan, 1 master, 3 slaves. Slaves are E5-2687W’s @ 3 GHz. Master is seeing all 3 slaves in encoding servers list (with threads info 48). Source material is 12-bit tiffs with 9 MB each. We’re seeing a lot less throughput than expected: ~ 6 fps. On the slaves status says ~ 0.1 - 0.2 fps respectively. Log messages on the slaves’ status panes have a lot of “error during async_read ([numbers 10009 and 10054 mostly])” messages. Occasionally logs list an encoded frame with roughly these numbers: receive up to 23 seconds, encode 1 second, send up to 1 second. What could we check? Kind regards, Wolfgang