Lol. Putting the updating sign is up to them. If they are busy coding, they may not bother to do so and just update.
Reasons that caused the lagg:
1. Vps
Or
2. Arthur/Jackson programming
Other than those, I dont see any other reason causing the lagg.
Well, if you experience those lagg, they are probably temporary. Just bear with it for few mins and it will be over:)