DynamicSlowMPU:with just one big

Build 8446 on fairground/remove-comment-footer
1300px
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The baseline is taller than the new snapshot (1300x758 to 1300x755).
Baseline History
Build 84464604bcd
Current build. There are unaccepted changes, so build 8422 is still the baseline.
Build 84226c7620e current baseline
Accepted by Charlotte Emms.
Build 8413b786b8c
Accepted by Charlotte Emms.
Build 77721b78394
Auto-accepted
Build 7771eeebf58
Auto-accepted
Commenting is disabled because there's a newer build on this branch