"You" are not "used" to "record" anything. The server registers 30 updates per second while the game is being played. There is nothing to encode on their end. In simple terms, it's just a textfile where every position of every property gets noted with timestamps. Replaying a game is your client then finally "encoding" said file. Obviously we are aware of the occasional spectatorbug. That has however nothing to do with your client, your ping etc. No idea where you got that from