Optimize duty performance #121

Job	Run time
target-branch-check	2s
extract-msrv	5s
cargo-fmt	9s
compile-with-beta-compiler	24m 31s
op-pool-tests	24m 14s
release-tests-ubuntu	24m 12s
debug-tests-ubuntu	24m 12s
beacon-chain-tests	24m 13s
release-tests-windows	24m 1s
slasher-tests	5m 30s
state-transition-vectors-ubuntu	14m 42s
check-benchmarks	9m 4s
check-msrv	10m 18s
clippy	7m 54s
dockerfile-ubuntu	24m 11s
doppelganger-protection-test	24m 12s
ef-tests-ubuntu	24m 11s
execution-engine-integration-ubuntu	23m 11s
merge-transition-ubuntu	24m 11s
no-eth1-simulator-ubuntu	18m 36s
syncing-simulator-ubuntu	24m 11s
arbitrary-check	1m 43s
cargo-audit	4m 35s
cargo-udeps	14m 23s
cargo-vendor	45s
eth1-simulator-ubuntu	12m 56s
	6h 30m 12s

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