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If you will open list of builds for big project it will load all builds and then paginate them using JS. But it's quite slow on projects with big build list.
Yes. It is intentional. In fact Patternfly recommend to use it this way. It allows you quite easy (and fast once loaded) to sort table, filter and search rows. If you disagree, I am open to discussion (lets meet in kitchen :)) but this is not bug.
Problem is that on 3k builds project it takes 15-20 sec to load. I can't imagine what will happen on project with 20k or more builds.
You can try it on rubygems project which has 70k builds :)