The company’s headline growth looks solid, but a slowdown in one of its most profitable segments is the real reason for investor concern.

If you hold Visa (V) stock, you might be feeling a bit of whiplash. The company’s latest earnings report was strong, yet the stock has trailed the index badly over the past year. That disconnect suggests the market is looking past the big, impressive numbers and focusing on a potential crack in the foundation.

The number that truly matters right now isn’t total revenue or profit. It’s the engine that powers both: Payments Volume Growth. And a specific part of that engine is starting to sputter.

At first glance, everything looks fine. Visa’s global payments volume – the total dollar amount of all transactions on its network – grew a healthy 9% year-over-year in its most recent quarter. But the most current data, which the company provides for the first few weeks of the new quarter, reveals a concerning detail.

In that data, growth in travel-related cross-border volume slowed to just 5% year-over-year. That is a sharp deceleration from the 10% growth rate the same segment posted for Q1. While a month is not a trend, a drop of that magnitude in a key category warrants attention.

This segment carries disproportionate weight. Cross-border transactions, where a card from a country is used in another, are one of Visa’s most lucrative businesses. These international swipes generate significantly higher fees than domestic ones, feeding directly into the company’s high-margin, International transaction revenue line.

A slowdown here has an outsized impact on profitability. Management attributed the softness to factors: the impact from the Middle East conflict and the timing of a major holiday. While the latter is a temporary calendar effect, the former is a geopolitical risk with an unpredictable duration. This is where an abstract fear of global instability shows up as a hard number, hitting the part of the business that matters most to the bottom line.

The stock’s underperformance suggests investors are already sensitive to any signs of weakness in Visa’s growth story. A sustained period of slower growth in cross-border travel would force the company to rely more heavily on lower-margin domestic spending or its fast-growing but still maturing value-added services division to carry the weight.

For anyone holding the stock, the headline 9% growth figure is now secondary. The real test is whether that 5% cross-border travel number bounces back sharply in the coming months. That figure will likely tell you if the market’s caution is justified or if this is simply a moment of misplaced fear.

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