Screen transition is slower for larger (podcast, meditation category)

[brettdh]

Describe the bug
The time it takes between tapping on a (podcast, meditation category) and transitioning to the list of (podcast episodes, meditations) slows down as the number of (episodes, meditations) increases.

To Reproduce

1. Tap the "Podcasts" tab
2. Tap "Ask Science Mike", the podcast with the most episodes. Notice the transition delay.
3. Navigate back to the Podcasts list.
4. Tap "THIS" or another podcast with fewer episodes. Notice the quick transition.

Expected behavior
Tapping on any (podcast, meditation category) should transition to its listing page without any delay.

Screenshots

Smartphone (please complete the following information):

• Device: iPhone X
• OS: iOS 12.1

Also seen in production mode on the simulator (see screen recording above).