Execution Speed and Slippage: Why They Matter for Scalpers
Execution speed is the time between clicking "buy" and your order being filled. Slippage is the difference between the price you requested and the price you actually got. For swing traders, both are minor annoyances. For scalpers targeting 3-5 pip profits, they can be the difference between a profitable strategy and a losing one.
What Is Execution Speed?
Execution speed measures how quickly your broker processes and fills your order. It's typically measured in milliseconds (ms). A well-optimised ECN broker might fill orders in 30-50ms. A slower broker might take 200-500ms.
Why it matters for scalping: If you see a price and click buy, but the order takes 300ms to fill, the price may have moved. On a fast-moving pair like GBP/JPY, even 100ms can mean a 0.5 pip difference.
What affects execution speed:
- Broker's technology and server infrastructure
- Your physical distance from the broker's servers
- Market conditions (volatile markets can slow execution)
- Whether the broker uses a dealing desk (slower) or STP/ECN (faster)
- Your internet connection quality
What Is Slippage?
Slippage occurs when your order fills at a different price than requested. If you place a buy order at 1.0850 and it fills at 1.0851, that's 1 pip of negative slippage.
Types of slippage:
- Negative slippage: You get a worse price than requested. This is the common concern.
- Positive slippage: You get a better price than requested. This happens too, but less frequently at most brokers.
- No slippage: You get exactly the price you requested.
What causes slippage:
- Low liquidity: Fewer market participants means fewer orders at each price level
- High volatility: Prices move faster than orders can be processed
- Large order size: Big orders may need to be filled across multiple price levels
- Slow execution: The longer your order takes to reach the market, the more the price can change
- Dealing desk intervention: Market makers may requote rather than fill at the requested price
Measuring the Real Cost of Slippage
For a scalper making 50 trades per day at 1 lot:
- Average slippage of 0.2 pips = $10 per day = $200 per month = $2,400 per year
- Average slippage of 0.5 pips = $25 per day = $500 per month = $6,000 per year
That's a meaningful amount, and it's completely invisible unless you're tracking your actual fill prices against your requested prices.
How to Minimise Slippage
Choose an ECN/STP broker. Brokers like IC Markets, Pepperstone, and Tickmill route orders directly to liquidity providers. This typically results in less slippage than dealing desk brokers.
Use a VPS. A virtual private server close to your broker's data centre reduces the physical distance your order travels. IC Markets, Pepperstone, FP Markets, and Tickmill offer free VPS for qualifying traders.
Trade during liquid hours. The London/New York overlap (13:00-17:00 UTC) has the deepest liquidity and therefore the least slippage.
Use limit orders instead of market orders. A limit order guarantees your price or better. The trade-off is that it might not get filled if the market moves away.
Avoid trading during news events. Major economic releases (NFP, central bank decisions) cause spreads to widen and slippage to increase dramatically.
Choose major pairs. EUR/USD, GBP/USD, and USD/JPY have the deepest liquidity. Exotic pairs have wider spreads and more slippage.
Broker Execution Comparison
While brokers don't always publish exact execution statistics, our testing and third-party data suggest:
| Broker | Execution Model | Reported Speed | VPS Available |
|---|---|---|---|
| IC Markets | ECN | ~40ms avg | Yes |
| Pepperstone | ECN/STP | ~30-60ms | Yes |
| Tickmill | ECN/STP | ~30-50ms | Yes |
| FP Markets | ECN/STP | ~40ms | Yes |
| Exness | Hybrid | Variable | Yes |
Exact speeds depend on your location, connection, and market conditions. Demo account testing gives you a reasonable approximation, though live execution may differ.
Key Takeaways
- Execution speed and slippage are real costs, especially for scalpers
- ECN brokers with VPS hosting deliver the fastest, most reliable execution
- Trade during liquid hours and use limit orders to minimise slippage
- Track your actual fill prices to measure slippage over time
- Choose brokers known for execution quality: IC Markets, Pepperstone, Tickmill
For our complete scalping broker rankings, see Best Forex Brokers for Scalping. For platform comparisons, read Best Platforms for Scalping. For strategy basics, see What Is Forex Scalping?.
Written by Neil C, BrokerAudit. Read our methodology.
