impala-shell hs2-http 3x slower than hs2 with high-latency network

Users reported slow client performance using hts-http routed across a public network. Performance testing of simple create/drop function with simulated high network latency shows a 3x performance difference between the hs2 and hs2-http protocols. 

Simulated latency:

sudo tc qdisc add dev lo root handle 1: prio priomap 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

sudo tc qdisc add dev lo parent 1:2 handle 20: netem delay 1000ms

sudo tc filter add dev lo parent 1:0 protocol ip u32 match ip dport 28000 0xffff flowid 1:2

sudo tc filter add dev lo parent 1:0 protocol ip u32 match ip dport 21050 0xffff flowid 1:2

See attached flamegraphs.