DynamicSlowMPU:with the first of two bigs boosted

Build 4241 on doml/remove-fronts-banner-ads-switch
740px
The baseline is shorter than the new snapshot (740x647 to 740x666).
Baseline History
Build 4241d3dac9a current baseline
Current build. Accepted by Max Duval.
Build 42360d4e4ec
Ancestor build. There were unaccepted changes, so this was not used as a baseline.
Build 4228a6e31fe
Inherited baseline identical to build 2474
Build 2474a989740
Accepted by Jamie B.
Build 24617405ee1
Auto-accepted
Build 207681411e8
Accepted by Daniel Clifton.
Build 20551a01a5b
Accepted by Anna Beddow.
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