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7-8 seconds? Something definitely sounds misconfigured. I've been running a 1.1.x cluster for quite a while and I've never seen a single row transaction take that long. And even the slowest queries took at most ~500ms, and that was with:

  - Replication factor increased to 5x (rather than the 3x default)
  - 8 indexes on the table being modified which also needed to be updated
  - Nodes spread across North America, incurring higher RTT latency between nodes
  - Relatively high contention on the data triggering client-side retries
  - HDD's as the storage medium (RockDB is optimized for SSDs)

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