Why latency varies through the trading day
The internet is a shared resource. When you send a packet from your home to your broker's server in London, that packet travels through your ISP's network, then across one or more backbone providers, then into the Equinix LD4 facility. At each hop, routers queue packets when they receive more traffic than they can forward instantly. During high-traffic periods, those queues get longer — adding milliseconds at each hop. Your broker's server has not changed. The path has changed under load.
Peak congestion: London session and the overlap
The London session (07:00–16:00 UTC) is the highest-volume trading period globally. The NY-London overlap (13:00–17:00 UTC) is the peak of that peak — both the highest trading volume and the highest internet backbone traffic. Traders connecting to LD4 brokers from the US, Asia, or Africa during this window typically see their highest daily latency readings. See our broker DC reference for datacenter context.
How it affects your trading
The problem compounds: the London-NY overlap is precisely when you most want tight fills (highest liquidity, biggest moves) but also when your latency is highest. News events scheduled for 13:00–16:00 UTC (NFP, FOMC, BoE) are the worst case — maximum market speed combined with maximum congestion. Learn more about slippage during news events.
After-hours: when latency drops
Asian session (22:00–07:00 UTC) sees significantly less backbone congestion on the UK and US internet infrastructure. Traders who run overnight EAs connecting to LD4 or NY4 brokers often see their best execution during these hours — not because the broker is different, but because the path is less congested. If you notice your EA fills better at 2am than at 2pm, this is the likely explanation.
How to reduce time-of-day latency variance
Option 1: Accept it. For swing traders, session-based latency variation is irrelevant. Option 2: Time your manual entries away from peak congestion windows when possible. Option 3: Use a proxy with peered connections to Equinix. TradersProxy nodes use dedicated peering at the Equinix internet exchanges (IX), which bypass some of the public backbone congestion. A connection routed through Equinix IX peering sees less variation than a purely public-internet path. See our MT4 setup guide for configuration. Learn more in our latency and jitter guide.