DynamicSlowMPU:with the first of two bigs boosted

Build 7493 on shrink-starrating
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Baseline History
Build 749342f7a05
Current build. There are unaccepted changes, so build 7478 is still the baseline.
Build 7226e49acb4
Accepted by Charlotte Emms.
Build 6215c5850e3
Auto-accepted
Build 4608c4b3fc0
Accepted by Ioanna Kokkini.
Commenting is disabled because there's a newer build on this branch