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Good connection ?

Sudden lags that distort all kinds of match results, Ping 341 (and worse) considered a good connection ???
Up to 500ms latency is coloured green (good) in the pictorial representations in lichess.org/lag .

But a lot depends on what time control you are playing. It might not be advisable to play bullet with the ping you describe. For longer time controls it wouldn't matter.
Not in the last time of game, also playing 10 min , a great lag is able of changing a game's result :-)