1. Is tornado usage causing significant performance degradations ?
   a. Should we replace tornado with asyncio/custom library (uvloop friendly)
   b. Test UCX (TCP only) this will not use tornado for comms and give us some idea of the performance benefits if we replaced tornado

2. Are we sending messages too frequently ?
   a. We can batch writes from worker -> scheduler by increasing worker batch sizes (2ms -> 20ms)

cc @gjoseph92