As Chad mentioned, the new app has been designed to have faster and more instantaneous performance than the outgoing application, and user feedback has been positive for app responsiveness.
If you could report this to our Support Team at support@trainerroad.com including your:
- Operating System
- CPU
- RAM
That would be very helpful 
Thanks in advance!
EDIT:
It seems like the speed you are noticing is on the initial launch. The first time you boot up the app will take much longer than each subsequent use. All the workouts and plans need to be loaded into the application the first time you boot the app.
Take note of the speed after the initial launch and let me know if it’s still being excessively slow 