perf: Write directly to file descriptor

[Stranger6667]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.01%. Comparing base (18cb352) to head (fe16669).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   97.91%   98.01%   +0.10%     
==========================================
  Files           3        3              
  Lines         288      303      +15     
  Branches       58       65       +7     
==========================================
+ Hits          282      297      +15     
  Misses          4        4              
  Partials        2        2              

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[codspeed-hq]

CodSpeed Performance Report

Merging #80 will degrade performances by 63.4%

_{Comparing dd/improve-perf (fe16669) with main (52f9e26)}

Summary

❌ 1 regression

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_writing_har	50.2 ms	137.1 ms	-63.4%