Several of the jenkins performance plots are showing a noticeable performance degradation. Many are 10-11%. The plots are:
http://build.wiredtiger.com:8080/job/wiredtiger-perf-lsm/plot/
http://build.wiredtiger.com:8080/job/wiredtiger-perf-evict/plot/
http://build.wiredtiger.com:8080/job/wiredtiger-perf-btree/plot/
All have the same changeset and two possible tickets responsible. It is either WT-5135 or WT-4715.