I've had the same issue, but it's not limited to Chinese tanks. When lag happens, it doesn't matter who's on the battlefield, from Australia to Zimbabwe.
Sometimes I get lag when it's just against bots. It's a combination of all things, but mostly chillingo itself.
Lag was so bad last night, I simply had to give up playing. I was literally parked on top of a dropped item for 3 seconds when another tank rolls up a receives the item. As may well expect my opponents where Euro/Asian: I received no drops, no loot, no kills, although there where several instances where I just sat there and pumped shot after shot after shot into my opponents tank!