Reduce copying and allocations #375

Job	Run time
mips_cross	4s
rustfmt	19s
build (1.57.0, ubuntu-latest)	5m 0s
feature_check	1m 33s
build (1.57.0, windows-latest)	6m 15s
test_all	2m 36s
feature_check (benchmarks)	1m 3s
build (1.57.0, macos-latest)	6m 46s
build (stable, ubuntu-latest)	5s
build (stable, windows-latest)	1m 29s
build (stable, macos-latest)	19s
build (beta, ubuntu-latest)	20s
build (beta, windows-latest)	59s
build (beta, macos-latest)	28s
build (nightly, ubuntu-latest)	20s
build (nightly, windows-latest)	48s
build (nightly, macos-latest)	41s
	29m 5s

Provide feedback