Observing ~8 to ~10% throughput drop in kv between default collection vs 1000 collection

Observing nearly ~10% drop in kv throughput for 1000 collections (workloadA , read/write:50/50), uniform request distribution ) when compared with default collection with uniform request distribution .

Avg Throughput (ops/sec), Workload A, 3 nodes, 12 vCPU, uniform distribution

http://perf.jenkins.couchbase.com/job/hercules/5002/

Throughput : 520,279 ops/sec

Avg Throughput (ops/sec), Workload CA, 3 nodes, 12 vCPU, uniform distribution, s=1 c=1000

http://perf.jenkins.couchbase.com/job/hercules/4969/

Throughput : 473,541 ops/sec

cpu and ops stats comparison   -

10% drop in throughput seem to be quite significant considering cpu is ~80% for both collection vs default-collection cases.  

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=hercules_700-3291_access_6a21&label=1000_collections&snapshot=hercules_700-3291_access_6544&label=default_collection