stream: optimize webstreams pipeTo #4057

Job	Run time
Build slim tarball	2m 4s
aarch64-linux: with shared libraries	18m 46s
aarch64-darwin: with shared libraries	20m 53s
x86_64-linux: with shared libraries	23m 15s
x86_64-darwin: with shared libraries	27m 49s
	1h 32m 47s

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