Реммор
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Synchronization is needed to use the game on different computers or to prevent Windows from crashing. So, synchronization is not mandatory. And yuPlay doesn't depend on it either. It sometimes doesn't load for me too - it depends on the server load, so don't worry ;).
Added 1 minute ago
You can safely disable synchronization if you don't plan to play with the same account on different computers.
How do I disable it?
..изведать то, чего не ведал сроду! глазами, ртом и кожей пить простор! кто в океане видит только воду, тот на земле не замечат ГОР