DynamicSlowMPU:with just one big

Build 4236 on doml/remove-fronts-banner-ads-switch
1300px
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The baseline is shorter than the new snapshot (1300x730 to 1300x741).
Baseline History
Build 42360d4e4ec
Current build. There are unaccepted changes, so build 3963 is still the baseline.
Build 24617405ee1
Auto-accepted
Build 207681411e8
Accepted by Daniel Clifton.
Build 1170978edb4
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This one is vastly different…

Dominik Lander
1y ago on build 4230

We used to leave space for an MPU. Now that we don't show MPU's, the space can be utilised by extra cards. Will wait for designer input