Practise
Put a clock on it
Knowing the moves and being fast at them are different skills, and only one of them needs a timer. Three tools, all of them free, none of them needing an account.
Everything here runs in your browser and keeps its records on your own device. Nothing is uploaded, and there is nobody to compare yourself against but yourself.
Every day
The timer
Competition flow, the sport's own average of five, and a history that stays yours. The one to use daily.
For fun
Race a real final
The actual scrambles from a recent final, against the times the competitors managed on the day.
The weak spot
Recognition trainer
Cases dealt at random angles against the clock. Recognition, not finger speed, is what separates a minute from twenty seconds.
Not sure what to do with the numbers once you have them? Practise like the sport counts explains how a session should be structured, and what the whole official record says about the times you can expect.