What's actually happening
Your ping to the broker measures how long a packet takes to travel from your machine, reach the broker's server, and return a response - the round-trip time (RTT). 300 ms means every order you send reaches the broker 150 ms after you click, and the fill confirmation arrives another 150 ms later.
During those 300 ms, the market is still moving. EURUSD at typical volatility might move 0.3-0.5 pips. XAUUSD at typical volatility might move 1-3 pips. During a news event, either can move 10x that.
For a position trader holding for days, none of this matters. For a scalper trying to enter on the first tick of a news spike, 300 ms is the entire window within which the market has already moved past their intended entry.
| Ping RTT | Scalping | News trading | Day trading | Swing / position |
|---|---|---|---|---|
| Under 30 ms | Excellent | Excellent | Excellent | Irrelevant |
| 30–80 ms | Good | Good | Fine | Irrelevant |
| 80–150 ms | Workable | Workable | Fine | Irrelevant |
| 150–300 ms | Problematic | Problematic | Acceptable | Irrelevant |
| 300 ms+ | Serious issue | Serious issue | Noticeable | Irrelevant |