Major schedule performance issue on Mobile device

[fcamblor]

When I open schedule on my Android device, it takes sometimes a dozen of second to switch from one day to another on Devoxx Schedule.

This is not acceptable and needs to be urgently fixed.

[fcamblor]

fixed and deployed to demo, prod and devoxx-prod

@stephanj you should see huge perf improvements on schedule day switches + favorite button toggle 🥵