Java SDK 3.0.0-alpha7 performance degradation compared to 2.7.0 version

Java SDK  kv operations have degraded significantly in 3.0.0-alpha7 as compared to current production version SDK 2.7.0

 Below are two KV workloada tests carried out on CB Server version 6.5.0-4380 with SDK 2.7.0 & SDK3.0.0-alpha7 version .  

Test Config Details : 

Test file : sdk_testing/ycsb_workloada_3nodes_cpu_eph_sdk_mh.test

Test Setup :
mem_quota = 40960
initial_nodes = 3
num_buckets = 1
online_cores = 6

bucket_type = ephemeral
eviction_policy = nruEviction

items = 20000000
time = 600
boost = 12
workers = 96
workload_instances = 6
enable_mutation_token = true
kv_endpoints = 1

workload_path = workloads/workloada 

YCSB Version : https://github.com/couchbaselabs/YCSB/tree/couchbase3-new-durability

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=hebe_650-4380_access_d40b&label=sdk300_alpha7&snapshot=hebe_650-4380_access_45d0&label=sdk_270

Client Side - Java CPU comparison : 

OPS Comparison :

Server Side CPU utilization Comparison :