Views incremental index creation time has gone up

Incremental index creation time has gone up roughly 30% in build 4449: 

http://172.23.123.43:8000/getchangelog?product=couchbase-server&fromb=6.5.0-4448&tob=6.5.0-4449

Test:

Incremental index (min), 4 nodes, 1 bucket x 20M x 2KB, non-DGM, 4 x 4 views, no mutations

4449 - http://perf.jenkins.couchbase.com/job/leto/10982/ - 20.2

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10982/leto-srv-01.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10982/leto-srv-02.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10982/leto-srv-03.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10982/leto-srv-04.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10982/tools.zip

4448 - http://perf.jenkins.couchbase.com/job/leto/10989/ - 13.2

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10989/leto-srv-01.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10989/leto-srv-02.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10989/leto-srv-03.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10989/leto-srv-04.perf.couchbase.com.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-10989/tools.zip

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=leto_650-4449_incr_index_6f39&snapshot=leto_650-4448_incr_index_92de