Hadrian slow to start tests

When I say

rae@build01|21:35:54 ~/ghc/ghc-homo> ./hadrian/build test --freeze1 --freeze2 --docs=none --flavour=devel2+werror --only=T16135

Hadrian says

Up to date
| Run Testsuite GetExtraDeps: none

It then waits 5 seconds or so. These 5 seconds or so are annoying when I'm going through test case failures. Is this avoidable?

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