34 When you optimize, you end up not being able to win

? Introduction

MetaTrader's Strategy Tester has powerful features.

That is the optimization feature.

Period.

Parameters.

Conditions.

Combinations.

With a vast number of trials,

you can find the best-performing combination.

At first glance, it seems like a dream feature.

However, in reality, many EAs break due to optimization.

Why is that?

? What does optimization actually do

Optimization does not predict the future.

It tunes to the past.

For example,

settings that make a profit only in 2024.

settings that are strong only in the first half of 2025.

This can be discovered.

But,

there is no guarantee it will profit in 2027.

In other words, optimization is not a process of seeking future answers, but

a process of seeking adaptation to the past.

? The brighter the numbers, the more to doubt

EA developers feel relieved when they see beautiful numbers.

Win rate 95%.

Profit factor 4.

Drawdown 1%.

Consistently rising year over year.

But in reality,

such results can be more dangerous.

Markets contain noise.

periods that happened to win by coincidence.

periods that happened to perform well by chance.

This is why such elements get incorporated.

As a result,

you end up with an EA that does not work in the future.

? What really matters to look at

What matters is not the top performance.

Stability.

For example,

profit persists when the period is shifted.

it does not collapse drastically when the currency is changed.

it endures with slight parameter changes.

This is what matters.

A strong EA is not the highest-performing EA.

It is an EA that is hard to break.

? The market keeps changing

Markets are always changing.

Interest rate policy.

Liquidity.

Participants.

AI trading.

High-frequency trading.

All of these alter market structure.

In other words,

an EA that was optimal in the past

is unlikely to be optimal in the future.

? MAEP perspective

AI also overestimates optimization results.

Because AI loves numbers.

But trading is statistics.

What is needed is,

not the peak value,

but the ability to survive for a long period.

✅ Summary

Optimization is convenient.

But over-optimizing,

EA loses resilience to the future.

What you should really look for is not the maximum profit.

It is the region where profits persist over the long term.