Within the Jenkin Pipeline View, any build that contains

cbwf-controller

, is causing a HTTP GET request to https://example.com/job/project/job/BRANCH_NAME/3/wfapi/changesets?_=1476824899808.

Each branch of a project on initial load will make a request to that endpoint. That will then cause the Jenkins process spike because it is trying to fulfill all of the requests.
An example of the element which has that controller is

<div class="changeset-box cbwf-widget cbwf-controller-applied run-changesets" cbwf-controller="run-changesets" objecturl="/job/ssw/job/theater-client/job/SSW-416/4/wfapi/changesets"><div><div class="run-changesets">

Build #10 will cause a GET request while build #9 wouldn't