The pages that allow associating subscriptions with other objects (Content Host and Activation Key) load the full data set on List/Remove and Add pages. If the data set is large, this could to significant delay.
This may not be a common usage concern for most customers but for the few with a lot of subscriptions (with an implication that these are large important customers), this may make effective use of the tool difficult.
Created from redmine issue http://projects.theforeman.org/issues/6309
Upstream bug component is WebUI