Why are effects previews lagging

The display window for effects don't seem to be in sync with what is being played either in the waveform or multitrack view.

For example, when I'm using a DeEsser, if I were to play with the DeEsser opened, the audio being played doesn't show up in the display window (where the frequency span is shown) until a second afterwards, almost like what's being shown in that display window is delayed. I don't think this is a latency issue as everything still sounds fine, it's just annoying when trying to figure out where the sibilances are and not being able to accurately find it because the actual display is delayed by half a second or so.

Any idea if this is a bug or if there's a way to fix that in the preferences?