The Speed Obsession: Why Sub-10ms Changes Everything
*By Marcus Chen, Founder @ Zero
The Number That Haunts Me
10 milliseconds.
That's it. That's the number.
Most people hear "10 milliseconds" and think: That's nothing. That's invisible. That's irrelevant.
They're wrong.
10 milliseconds is the difference between catching a moment and missing it forever.
The Problem With "Fast Enough"
In e-commerce, everyone talks about speed.
Page load times. Checkout optimization. Server response.
And they're right to care. Every second of delay costs conversions.
But there's a different kind of speed nobody talks about.
Decision speed.
How fast can you understand what's happening?
How fast can you decide what to do?
How fast can you act?
Most systems measure this in seconds. Some in hundreds of milliseconds.
We measure it in single digits.
Why Milliseconds Matter
Here's what happens in a customer's mind during checkout:
- A thought flickers.
- A hesitation forms.
- A decision crystallizes.
This entire sequence? It happens in moments. Fractions of moments.
If you react after the decision is made, you're too late.
If you react during the hesitation, you're too early. You'll feel intrusive.
There's a window. A tiny window. Measured in milliseconds.
Hit that window, and everything changes.
Miss it, and you're just another popup.
The Obsession
I became obsessed with this window three years ago.
Not academically. Obsessively.
I wanted to understand: What's the actual latency budget? How fast does "fast" need to be?
The answer surprised me.
It's not about being fast. It's about being precisely fast.
Too slow: the moment passes.
Too fast: you're interrupting, not helping.
The sweet spot? Under 10 milliseconds from signal to action.
At that speed, intervention feels natural. Almost unconscious.
The customer doesn't feel targeted. They feel... understood.
What This Required
Getting to sub-10ms wasn't an optimization problem. It was an architecture problem.
Everything had to be rethought.
- Where computation happens.
- How decisions are made.
- What gets processed and what gets ignored.
We threw out conventional wisdom. Built from first principles.
The result is something that operates at a speed most systems can't even measure, let alone match.
The Difference You Feel
Speed at this level creates experiences that are hard to describe but easy to feel.
Customers don't know why the experience feels smoother. They just know it does.
They don't notice the interventions. They notice the outcomes.
Fewer abandoned carts. More completed purchases. Higher satisfaction.
Not because we chased them after they left.
Because we were there—invisibly, instantly—when they needed us.
The Competition Can't Follow
Here's the uncomfortable truth about speed:
You can't patch your way to sub-10ms.
You can't optimize legacy systems to get there.
You either build for it from day one, or you don't have it.
We built for it.
That's not arrogance. It's architecture.
February 24th
When we launch, people will see the results.
Higher conversions. Lower abandonment. Better experiences.
They'll try to reverse-engineer the "trick."
But there is no trick.
There's just speed.
The kind of speed that changes what's possible.
Marcus Chen is the founder of ZeroCart, launching February 24th, 2026.
The obsession continues: @ZeroCartAI
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