Every few weeks someone asks me whether they should rent a VPS in the same data center as their exchange to shave milliseconds off their orders. Usually they have read something about colocation and high-frequency shops paying for cross-connects measured in microseconds, and they have quietly concluded that their own fills are worse because their laptop is a few hundred milliseconds too far away. Sometimes they are right. Most of the time they are optimizing the one thing that costs them almost nothing, while ignoring the thing that is actually eating their returns.
The useful way to think about latency is not in milliseconds. It is in how much the price can move against you during that delay, and how big that move is relative to the profit you were expecting from the trade. Latency is only ever a cost because prices keep moving while your order is in flight. If nothing moved, you could take an hour to place a trade and get exactly the price you saw. So the real question is never how fast you are. It is how fast the market is relative to how long you plan to hold.
Latency becomes slippage through volatility
Here is the mental model I keep coming back to. Take the volatility of whatever you trade and express it as how much the price typically moves per second. A liquid crypto perp might move a fraction of a basis point in a calm second and several basis points in a violent one. A large-cap stock during regular hours is usually calmer than that. Now multiply that per-second drift by your latency in seconds. That product is roughly the expected slippage that latency alone contributes to a single fill, before you even account for the spread you cross or the size you push through the book.
Run the numbers and the punchline falls out fast. If you are two hundred milliseconds slower than someone else, and the asset drifts a fraction of a basis point in a fifth of a second under normal conditions, the latency is costing you a rounding error. You would need thousands of trades before it added up to anything you could measure over the noise. The place this flips is during the exact moments you care about most, which is the catch nobody mentions.
Volatility is not constant. It clusters. The seconds right after a funding flip, a liquidation cascade, a CPI print, or a token unlock can be tens or hundreds of times more volatile than a quiet afternoon. In those windows the same two hundred milliseconds can cost you a meaningful chunk of your edge, because the price is now sprinting instead of strolling. So latency does not hurt you uniformly. It hurts you specifically when you are trying to react to news or to a fast move, which is also when everyone else is trying to do the same thing and the book is thinnest.
Where milliseconds matter and where they do not
Sort your strategy by holding period and most of the argument resolves itself. If you hold a position for hours or days, your entry price being off by a basis point or two is genuinely irrelevant. The trade thesis has to survive moves of several percent, so a fraction of a percent at entry is noise you will not notice at exit. Buy-and-hold, swing trading, most DCA, position trading, anything driven by a multi-day signal. None of these care about your latency in any way you can feel.
The strategies where latency turns into real money share a few traits:
- You are reacting to a public event that many others see at the same instant, so being late means the good price is already gone.
- Your edge per trade is thin, a handful of basis points, so a basis point of latency slippage eats a large fraction of it.
- You trade frequently, so small per-trade costs compound into something that shows up on your monthly statement.
- You cross the spread or take liquidity rather than resting passive orders, so you pay for every moment of delay directly.
Market making, latency arbitrage, cross-exchange arbitrage, liquidation hunting, and news-reaction scalping all check most of those boxes. If you are doing any of those seriously, geography and round-trip time are real costs and a nearby VPS can pay for itself. If you are not, you are chasing a decimal that does not move your P and L.
The costs that dwarf your ping
The uncomfortable part is that for most retail setups, network latency is nowhere near the biggest source of delay. Your order passes through a chain, and the slow links are rarely the wire. There is the time your own code or your clicking hand takes to decide and fire. There is the exchange's matching engine queue, which under load can add far more delay than any distance you could close with a VPS. There is rate limiting, which quietly throttles you exactly when volatility spikes and everyone is hammering the API. And there is the spread and the depth of the book, which is a real, guaranteed cost on every single fill and usually swamps the latency term by an order of magnitude.
I have watched people spend a weekend moving their bot to a server thirty milliseconds closer to the exchange while placing market orders that cross a spread costing them ten times that in slippage on every fill. They optimized the cheap thing and left the expensive thing untouched. Before you pay for proximity, price out the spread you are crossing and check whether your losses cluster in high-volatility windows or are spread evenly. Even spread means the problem is your strategy or your fees, not your ping.
A quick way to decide
Here is the checklist I would run before renting anything:
- Write down your typical holding period. If it is longer than a few minutes, stop here. Latency is almost certainly placebo for you and you can spend the money elsewhere.
- Estimate your edge per trade in basis points, honestly. If it is large, latency slippage is a small tax you can absorb.
- Look at when your slippage happens. Pull your fills and check whether the bad ones cluster around news, funding, and cascades, or are uniform. Clustering is the signal that speed might help.
- Compare the spread you cross to your estimated latency slippage. If the spread is bigger, fix that first by resting orders or choosing a deeper venue.
- Only then, if you are reacting to fast public events with a thin edge and frequent trades, consider a VPS near the matching engine.
Most people who run this end up not renting the server, which is the right answer for them. The ones who should rent it usually already knew, because they had already measured their slippage and watched it spike in the exact windows a faster link would help. When I built the execution routing in Blockcircle across a lot of venues, the thing that mattered far more than shaving milliseconds was letting people rest orders and pick the venue with real depth, because that is where the slippage actually lives for the vast majority of trades. Speed is the last knob to turn, not the first, and for most retail strategies it is a knob that is not connected to anything.