Latency

Latency is one of the most under-discussed yet operationally consequential parameters in EA deployment. The marketing language around VPS doesn't distinguish meaningfully between latency tiers, but the realised performance impact for execution-sensitive strategies is large.

Latency components in EA execution:

• **Tick delivery latency**: broker pushes price ticks to the VPS via TCP. From LD4 colocation to Tier-1 ECN broker: 1-3ms. From New York consumer VPS to London broker: 80-120ms • **EA decision time**: the EA processes the tick and decides whether to act. For optimised EAs: sub-1ms. For poorly-coded EAs with synchronous file I/O or external calls: 5-50ms or worse • **Order submission**: the EA sends the order to the broker. From LD4 colocation: 1-3ms. From distant VPS: 60-100ms • **Broker matching**: the broker matches the order against liquidity-provider quotes. At Tier-1 ECN brokers: 1-3ms. At brokers using non-colocated infrastructure: 5-30ms • **Confirmation back to EA**: similar latency to order submission • **Total round-trip**: typically 6-15ms with LD4 colocation, 80-200ms+ from retail VPS

Why latency matters for EA strategy classes:

• **Scalping (M1, sub-minute holds)**: extremely latency-sensitive. Each 10ms of additional latency can flip a profitable scalper to break-even or losing. Scalperology AI's published 6-9% monthly returns assume sub-15ms LD4-colocated execution; the same strategy on retail VPS produces materially different (worse) results • **Day-trading (M15-H4)**: moderately latency-sensitive. 50-100ms latency degradation reduces edge but doesn't eliminate it. Most-profitable-tier EAs in this class still benefit from premium VPS • **Swing trading (H4-D1)**: low latency sensitivity. The trade lifecycle is long enough that 100-200ms latency doesn't materially affect realised performance. Safety-tier swing strategies can run on standard VPS without concern • **Trend-following (H4+)**: lowest latency sensitivity. Position-holding measured in days; latency at any reasonable scale has negligible impact

Latency mitigation:

• **LD4 colocation** (Equinix London Docklands datacenter): same datacenter as many Tier-1 ECN broker servers, sub-15ms round-trip. Premium VPS providers: Beeks Financial Cloud, FXVM, ChocoPing. Editorial preference for scalping deployment • **NY4 colocation** (Equinix New York datacenter): same datacenter as US-based brokers and many liquidity providers. Suitable for NY-session strategies • **Generic London VPS**: London-based but not colocated, 20-50ms round-trip. Acceptable for day-trading and swing strategies • **Generic VPS in other regions**: 60-200ms round-trip depending on geography. Acceptable only for trend-following or longer-horizon strategies • **Retail home internet**: 60-200ms round-trip plus internet stability issues. Suitable for learning and demo only; not for live deployment of any latency-sensitive strategy

For EA buyer evaluation: vendors of scalping EAs should explicitly recommend LD4 or NY4 colocation in their deployment guidance. Vendors who say "any VPS will work" for scalping products either don't understand latency sensitivity or are hand-waving on operational requirements. The published returns on their verified account assume a specific deployment environment; buyer realised returns will differ proportionally to how far the buyer's deployment differs from the verification environment.