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A trade goes wrong in a way that doesn't make sense: you clicked close at a decent price, the fill came back several pips worse, and the chart shows no spike. Before blaming the broker, it's worth ruling out your own connection.

Home connections fail in small ways that are easy to miss:

- Wi-Fi drops for one or two seconds when the microwave is on or a neighbour's router changes channel.
- The ISP has packet loss in the evening when everyone is streaming.
- A laptop's power-saving mode throttles the network adapter.
- A large cloud backup or game update saturates the upload.

During one of these blips, the platform may freeze for a moment, then send your order late. The fill reflects the price when the order arrived, not when you clicked.

How to check:

- Run a continuous ping to your broker's server (or a reliable address like 1.1.1.1) during a session and log it with timestamps.
- Note the exact time of any bad exit.
- Compare. If the bad fill lines up with a spike to 400 ms or a few timeouts, you have your answer.

The fix is usually boring: wired Ethernet, a VPS for the platform, and no large downloads during trading hours.

Has anyone traced a bad fill back to their own network?

Several different things feel identical from the chair, and they have different causes. Sorting them out saves a lot of guessing.

Slow because of the route. Internet traffic between two points can take different paths on different days. Providers change peering arrangements, reroute around congestion, and sometimes send traffic the long way around. The signature is a stable machine and stable broker, with ping to the broker's server rising by tens of milliseconds for hours or days, then dropping again. A traceroute taken on a good day and a bad day usually shows where the extra hops appear.

Slow because of DNS. The domain name has to be turned into an address, and a slow or overloaded resolver delays connections. It mostly hurts at login or when the platform reconnects, not during steady trading. The signature is slow reconnects with normal speed afterward. Switching resolvers is a quick test.

Slow because of the broker's side. Load on the server changes through the day. The signature is that the delay follows market activity rather than the clock of the internet provider, and it hits other clients at the same broker simultaneously. Forums and other traders can confirm it quickly.

Slow because of the local machine. Background updates, antivirus scans, and other applications hogging bandwidth or CPU produce delays that look like network trouble. The signature is a problem that disappears after closing everything else.

The way to separate them is to keep a short log of ping, traceroute, and order confirmation time when things feel fast and again when they feel slow. Comparing the two snapshots usually points to the right culprit within a few tries.

A hedge is in order: how much each of these matters depends on the provider, the region, and the broker's infrastructure, and none of them should be treated as the default explanation.

Which of the four has turned out to be the cause most often for you, and what tool made it obvious?