It seems sometimes the timer at the start of a map doesn't count down from 3 to 0. Sometimes it counts down from 1 to 0, sometimes it doesn't appear at all.

Sounds a little similar to this Topic-562468

and yea I've noticed this since after the Christmas update was removed, if I remember correctly

Yeah this always happens for me a lot, skips numbers in the countdown, and lag spikes every time its a new round.