[Impeller] slow frame in new gallery while navigating to travel application about flutter

[jonahwilliams]

Yup, they're too big:

Another exception was thrown: Image packages/flutter_gallery_assets/assets/studies/3.0x/crane_card_dark.png has a display size of 777×546 but a decode size of 888×600,
which uses an additional 565KB (assuming a device pixel ratio of 2.625).
W/WindowOnBackDispatcher( 7767): OnBackInvokedCallback is not enabled for the application.
W/WindowOnBackDispatcher( 7767): Set 'android:enableOnBackInvokedCallback="true"' in the application manifest.
Another exception was thrown: Image packages/flutter_gallery_assets/assets/studies/3.0x/crane_card_dark.png has a display size of 777×546 but a decode size of 888×600,
which uses an additional 565KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/assets/studies/3.0x/rally_card_dark.png has a display size of 777×546 but a decode size of 888×600,
which uses an additional 565KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/assets/studies/3.0x/crane_card_dark.png has a display size of 777×546 but a decode size of 888×600,
which uses an additional 565KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/crane/destinations/3.0x/fly_0.jpg has a display size of 157×147 but a decode size of 1200×1200, which
uses an additional 7379KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/crane/destinations/3.0x/fly_1.jpg has a display size of 157×147 but a decode size of 1200×1230, which
uses an additional 7566KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/crane/destinations/3.0x/fly_3.jpg has a display size of 157×147 but a decode size of 1200×1131, which
uses an additional 6948KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/crane/destinations/3.0x/fly_2.jpg has a display size of 157×147 but a decode size of 1200×1182, which
uses an additional 7266KB (assuming a device pixel ratio of 2.625).
Another exception was thrown: Image packages/flutter_gallery_assets/crane/destinations/3.0x/fly_4.jpg has a display size of 157×147 but a decode size of 1200×924, which
uses an additional 5654KB (assuming a device pixel ratio of 2.625).

Thumbnails people!