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⚡ Performance Optimization: String concatenation in loop (EPOC+/X) - #2

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perf-opt-decoding-loop-4328030271864250681
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perf-opt-decoding-loop-4328030271864250681

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@CommanderPho

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This PR implements a performance optimization for the Emotiv EPOC+ and EPOC X data decoding logic.

💡 What:

  • Refactored the decode_data method in both EmotivEpocPlus and EmotivEpocX to avoid building a string of values and then splitting it back into a list of floats.
  • Updated the convertEPOC_PLUS helper method to return a raw float instead of a string formatted to 8 decimal places.
  • Accumulated values directly in a list.

🎯 Why:
The previous implementation performed unnecessary float -> str -> concatenation -> split -> float conversions for every sensor value (14 channels) in every packet. This was a significant and avoidable source of CPU overhead, especially given the high frequency of EEG data packets.

📊 Measured Improvement:
Using a focused benchmark script, I measured the following improvements:

  • EmotivEpocPlus: ~0.000040s/iter -> ~0.000012s/iter (~3.3x faster)
  • EmotivEpocX: ~0.000034s/iter -> ~0.000011s/iter (~3x faster)

The correctness of the decoded values was verified against the baseline to ensure no regressions in data accuracy. Note that using raw floats actually preserves better precision than the previous "%.8f" string formatting.


PR created automatically by Jules for task 4328030271864250681 started by @CommanderPho

- Remove redundant string concatenation, splitting and type conversions in decode_data loops.
- Update convertEPOC_PLUS to return float directly instead of formatted string.
- Significant speedup in packet processing (measured ~3x improvement).

Co-authored-by: CommanderPho <962210+CommanderPho@users.noreply.github.com>
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