optimize unnecessary copy #1241

Job	Run time
Make RTC sdist	14s
Build RTC wheels (aarch64)	1m 18s
Build RTC wheels (x86_64 arm64)	52s
Build RTC wheels (AMD64)	1m 15s
Build RTC wheels (x86_64)	41s
Generating protobuf	22s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	53s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	38s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	36s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	28s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 4s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	28s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 37s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	27s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	46s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	50s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	34s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 4s
docs	-1s
Publish RTC release	-1s
	14m 5s

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