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Found by counting flushes on idle screens in the sim: - The compose field's cursor blinked (a redraw every 400 ms) as soon as a conversation opened, the keyboard hidden: lv_keyboard_set_textarea() focuses the field, and LVGL only stops a blink when the cursor moves. fieldFocus() sets the state and nudges the blink; also used for the WiFi and channel fields, which left theirs running. - lv_obj_align_to() restyles on every call, so the status bar's icons redrew every second; placeLeftOf() moves them only when they move. - Text colours set every second (nav bar, GPS status, Diag errors) go through setTextColor(), which skips an unchanged colour. - A LV_LABEL_LONG_DOT label writes its "..." into its own text, so setText() never matched and rewrote it every refresh (the nav bar's hint); labelShows() reads past the dots. - The map area, the area-outline, trail and vector-label layers were invalidated on every map refresh (every 3 s, a full-map redraw); now only when the view or what they draw changed. Idle map: 17 -> 1 flush in 5 s; list and settings screens: 0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>