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This commit implements several performance optimizations in the SMC_TrendBreakout_MTF_EA.mq5 Expert Advisor: 1. **Early Exit for Open Positions**: Moved the PositionSelect check to the top of the OnTick handler, immediately after the new bar check. This skips expensive indicator data fetching (CopyRates, CopyBuffer) when a position is already open. 2. **Minimized Data Payload**: Reduced the number of bars fetched from 3 to 2 for CopyRates and all CopyBuffer calls. The current strategy logic only requires the current and previous bars. 3. **Lazy Evaluation of Prices and Indicators**: Deferred SymbolInfoTick and ATR fetching until a trade signal is confirmed. 4. **Atomic Price Retrieval**: Replaced non-standard Ask/Bid variables with SymbolInfoTick for more efficient and robust price retrieval in MQL5. These changes significantly reduce terminal overhead and data transfer per tick, particularly improving performance during optimization and backtesting. Co-authored-by: Mouy-leng <199350297+Mouy-leng@users.noreply.github.com>
28 lines
3.4 KiB
Markdown
28 lines
3.4 KiB
Markdown
# Bolt's Journal ⚡
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This journal is for CRITICAL, non-routine performance learnings ONLY.
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- Codebase-specific bottlenecks
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- Failed optimizations (and why)
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- Surprising performance patterns
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- Rejected changes with valuable lessons
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## 2024-07-25 - MQL5 Native Functions vs. Scripted Loops
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**Learning:** My assumption that a manual MQL5 loop over a pre-cached array would be faster than built-in functions like `iHighest()` and `iLowest()` was incorrect. The code review pointed out that MQL5's native, built-in functions are implemented in highly optimized C++ and are significantly faster than loops executed in the MQL5 scripting layer. The original comment stating this was correct.
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**Action:** Always prefer using MQL5's built-in, native functions for calculations like finding highs/lows over manual loops, even if the data is already in a local array. The performance gain from the native implementation outweighs the overhead of the function call.
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## 2024-07-26 - Native ArrayMaximum/ArrayMinimum Efficiency
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**Learning:** Confirmed that native `ArrayMaximum()` and `ArrayMinimum()` are the preferred way to find extreme values in price arrays. Also, when using these functions, it's important to check if they return `-1` to avoid invalid array access, especially if the `count` or `start` parameters might be dynamic.
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**Action:** When replacing manual loops with native array functions, always include a check for the `-1` return value to ensure robustness while gaining performance.
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## 2026-01-19 - Native Object Cleanup in MQL5
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**Learning:** While iterating through chart objects manually is flexible, it becomes a major bottleneck if the chart has thousands of objects. For simple prefix-based cleanup (often used in indicators), the native `ObjectsDeleteAll(0, prefix)` is significantly more efficient than a scripted loop calling `ObjectName()` and `StringFind()` for every object on the chart.
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**Action:** Use `ObjectsDeleteAll()` for bulk object removal by prefix whenever the "keep N latest" logic is not strictly required or can be safely bypassed for performance.
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## 2026-01-20 - Robust New Bar Check in MQL5 OnCalculate
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**Learning:** An early exit in `OnCalculate` based on bar time MUST check `prev_calculated > 0`. If `prev_calculated == 0`, the terminal is requesting a full recalculation (e.g., after a history sync or data gap fill), and exiting early would result in stale data. Also, using `iTime()` is more robust than indexing into the `time[]` array if the array's series state is unknown.
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**Action:** Always wrap "new bar" early exits in indicators with `if(prev_calculated > 0 && ...)` and prefer `iTime()` for the current bar's timestamp.
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## 2026-01-20 - MQL5 OnTick Execution Flow Optimization
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**Learning:** Significant performance gains in MQL5 EAs can be achieved by carefully ordering the logic in `OnTick`. Moving the `PositionSelect` check before `CopyRates` and `CopyBuffer` avoids expensive data operations when a trade is already active. Additionally, reducing the requested bar count in data fetching functions to the absolute minimum (e.g., 2 instead of 3) and using `SymbolInfoTick` for atomic, lazy price retrieval further reduces overhead.
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**Action:** Always place 'gatekeeper' checks (new bar, position existence, terminal trading allowed) at the top of `OnTick` and minimize the data payload for indicator and price fetching to only what is strictly necessary for the current bar's logic.
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