The two questions for pacing that helped me are these:
1-Is this update relevant? This can be from build up(as long as the build up leads to something), foreshadowing and/or something important for the plot and/or characters.
2-Is this entertaining? Entertainment comes in many forms, from moments of awesomeness, funny, heartwarming or even moments that hit readers in the feels. Even some nightmare inducing moments can work. (which ones fit depends of the kind of story and the current scene)
If all or most of your updates answer yes to both questions, then you have a great pacing.
Some updates are entertaining but not relevant, this is entertaining filler. (it can happens sometimes but make sure it`s not something constant or you may lose engagement)
Some updates are relevant but not entertaining, like an info dump. Some info can be shared more organically when you show it in chunks.
If an update is not entertaining and not relevant, then that update is not necesary and completely skippable.
Hope this helps!