Platforms & AutomationLagRound-Trip Time
Latency
The delay between a trading decision or price update and the moment it reaches its destination, measured in milliseconds.
What Latency means
Latency is elapsed time in the trading chain. It accumulates in several places: the network hop between the trader's machine and the broker's server, queueing and processing inside the platform, the broker's own routing to a liquidity provider, and the provider's matching and acknowledgement. The figure usually quoted is round-trip time, the interval between sending an order and receiving confirmation. A home broadband connection to a distant server might show 80 to 150 milliseconds; a server in the same data centre can be under 5.
Latency costs money through slippage. During the delay the market can move, so the price at the moment of decision is not necessarily the price at the moment of fill, and on a broker using instant execution the same delay produces requotes instead. The sensitivity depends entirely on holding period. A strategy targeting 5 pips several times an hour is materially affected by an extra 100 milliseconds; a swing position held for a week is not affected in any meaningful way.
The common remedies are physical. Hosting the terminal on a VPS close to the broker's matching engine removes most of the network component, a wired connection removes wireless jitter, and closing bandwidth-heavy applications helps at the margin. What none of this can fix is the broker's internal processing or the dealing model, so a quoted low ping to a server tells a trader nothing about how long the broker actually takes to accept an order. Measure realised slippage instead.
Worked example
If EUR/USD is moving 0.5 pips per 100 milliseconds during a news release, cutting round-trip latency from 120 ms to 8 ms saves roughly half a pip per trade, which over 500 trades is about 250 pips.
Related terms
- VPS (Virtual Private Server)A remote always-on server, often hosted near the broker's data centre, that runs a trading terminal and its automation continuously.
- Execution SpeedHow quickly a broker accepts and fills a submitted order, commonly advertised as an average time in milliseconds.
- SlippageThe difference between the price a trader expected on an order and the price at which it was actually executed.
- FIX APIThe institutional messaging protocol for quotes and orders, offering low latency and direct routing but demanding setup and volume.
- ScalpingA trading style aiming for very small gains on many short-lived positions, typically held for seconds to a few minutes.
Frequently asked questions
What does Latency mean in forex trading?
The delay between a trading decision or price update and the moment it reaches its destination, measured in milliseconds.
How does Latency work in practice?
Latency costs money through slippage. During the delay the market can move, so the price at the moment of decision is not necessarily the price at the moment of fill, and on a broker using instant execution the same delay produces requotes instead. The sensitivity depends entirely on holding period. A strategy targeting 5 pips several times an hour is materially affected by an extra 100 milliseconds; a swing position held for a week is not affected in any meaningful way.
What is an example of Latency?
If EUR/USD is moving 0.5 pips per 100 milliseconds during a news release, cutting round-trip latency from 120 ms to 8 ms saves roughly half a pip per trade, which over 500 trades is about 250 pips.
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