lagg question

hi i have been playing crossfire for a year now and i always had 35 and lower ping but all of a sudden its in 40s and higher and when im in a room full alot of people my ping is like 45 and wen i play the game play make me look like im lagging but wen im in a room up to 6 people i dont lagg 0_o can anybody explain why is this

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