Improve remote store eval time (#2334) #3003

Job	Run time
cabal	9s
build-extra-hackages	7s
cabal-doExactConfig	9s
check-materialization-concurrency	24s
check-path-support	5s
closure-size	3s
docs	30s
haskell-nix-roots-do-not-require-IFDs	10s
hix	34s
hix-cabal	6s
hydra-ifdLevel-0-and-1	3m 8s
hydra-ifdLevel-2	2m 49s
hydra-ifdLevel-3	12m 12s
hydra-without-remote-builders-ghc9101	32s
hydra-without-remote-builders-ghc966	7s
maintainer-scripts	6s
multi-target	34s
nix-tools	11s
nix-build	35s
plan-extra-hackages	9s
runghc	11s
shellFor-hoogle	10s
shellFor-multiple-package	16s
shellFor-not-depends	17s
shellFor-single-package	17s
tests-benchmarks	8s
unit-tests	5s
update-docs	7s
	24m 11s

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