diff --git a/src/components/dialogs/UserDialog/UserDialog.vue b/src/components/dialogs/UserDialog/UserDialog.vue
index 0561430a..09ca8d99 100644
--- a/src/components/dialogs/UserDialog/UserDialog.vue
+++ b/src/components/dialogs/UserDialog/UserDialog.vue
@@ -42,7 +42,7 @@
                 <UserDialogAvatarsTab ref="avatarsTabRef" />
             </template>
 
-            <template v-if="userDialog.id !== currentUser.id" #Activity>
+            <template #Activity>
                 <UserDialogActivityTab ref="activityTabRef" />
             </template>
 
@@ -74,7 +74,7 @@
 </template>
 
 <script setup>
-    import { computed, ref, watch } from 'vue';
+    import { computed, onMounted, ref, watch } from 'vue';
     import { DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
     import { TabsUnderline } from '@/components/ui/tabs';
     import { storeToRefs } from 'pinia';
@@ -130,11 +130,9 @@
         if (userDialog.value.id !== currentUser.value.id && !currentUser.value.hasSharedConnectionsOptOut) {
             tabs.splice(1, 0, { value: 'mutual', label: t('dialog.user.mutual_friends.header') });
         }
-        if (userDialog.value.id !== currentUser.value.id) {
-            // Insert Activity before JSON
-            const jsonIdx = tabs.findIndex((tab) => tab.value === 'JSON');
-            tabs.splice(jsonIdx, 0, { value: 'Activity', label: t('dialog.user.activity.header') });
-        }
+        // Insert Activity before JSON
+        const jsonIdx = tabs.findIndex((tab) => tab.value === 'JSON');
+        tabs.splice(jsonIdx, 0, { value: 'Activity', label: t('dialog.user.activity.header') });
         return tabs;
     });
     const infoTabRef = ref(null);
@@ -206,6 +204,30 @@
         }
     );
 
+    watch(
+        () => userDialog.value.visible,
+        (visible) => {
+            if (visible && !userDialog.value.loading) {
+                loadLastActiveTab();
+            }
+        }
+    );
+
+    watch(
+        () => userDialog.value.activeTab,
+        (activeTab) => {
+            if (activeTab === 'Activity' && userDialog.value.visible && !userDialog.value.loading) {
+                activityTabRef.value?.loadOnlineFrequency(userDialog.value.id);
+            }
+        }
+    );
+
+    onMounted(() => {
+        if (userDialog.value.visible && !userDialog.value.loading) {
+            loadLastActiveTab();
+        }
+    });
+
     const userDialogLastMutualFriends = ref('');
     const userDialogLastGroup = ref('');
     const userDialogLastAvatar = ref('');
@@ -348,13 +370,7 @@
      *
      */
     function loadLastActiveTab() {
-        let tab = userDialog.value.lastActiveTab;
-        // Activity tab is not available for own profile; fall back to Info
-        if (tab === 'Activity' && userDialog.value.id === currentUser.value.id) {
-            tab = 'Info';
-            userDialog.value.lastActiveTab = 'Info';
-            userDialog.value.activeTab = 'Info';
-        }
+        const tab = userDialog.value.lastActiveTab;
         handleUserDialogTab(tab);
     }
 
diff --git a/src/components/dialogs/UserDialog/UserDialogActivityTab.vue b/src/components/dialogs/UserDialog/UserDialogActivityTab.vue
index 3f45e711..83b0b176 100644
--- a/src/components/dialogs/UserDialog/UserDialogActivityTab.vue
+++ b/src/components/dialogs/UserDialog/UserDialogActivityTab.vue
@@ -50,14 +50,14 @@
             style="width: 100%; height: 240px"
             @contextmenu.prevent="onChartRightClick"></div>
 
-        <!-- Online Overlap Section -->
-        <div v-if="hasAnyData" class="mt-4 border-t border-border pt-3">
+        <!-- Online Overlap Section (friends only) -->
+        <div v-if="hasAnyData && !isSelf" class="mt-4 border-t border-border pt-3">
             <div class="flex items-center justify-between mb-2">
                 <div class="flex items-center gap-2">
                     <span class="text-sm font-medium">{{ t('dialog.user.activity.overlap.header') }}</span>
                     <Spinner v-if="isOverlapLoading" class="h-3.5 w-3.5" />
                 </div>
-                <div v-if="hasOverlapData" class="flex items-center gap-1.5 flex-shrink-0">
+                <div v-if="hasOverlapData" class="flex items-center gap-1.5 shrink-0">
                     <Switch :model-value="excludeHoursEnabled" class="scale-75" @update:model-value="onExcludeToggle" />
                     <span class="text-sm text-muted-foreground whitespace-nowrap">{{
                         t('dialog.user.activity.overlap.exclude_hours')
@@ -118,16 +118,69 @@
                 {{ t('dialog.user.activity.overlap.no_data') }}
             </div>
         </div>
+
+        <!-- Top Worlds Section (self only) -->
+        <div v-if="isSelf && hasAnyData" class="mt-4 border-t border-border pt-3">
+            <div class="flex items-center justify-between mb-2">
+                <span class="text-sm font-medium">{{ t('dialog.user.activity.most_visited_worlds.header') }}</span>
+            </div>
+            <div v-if="topWorlds.length === 0 && !isLoading" class="text-sm text-muted-foreground py-2">
+                {{ t('dialog.user.activity.no_data_in_period') }}
+            </div>
+            <div v-else class="flex flex-col gap-0.5">
+                <button
+                    v-for="(world, index) in topWorlds"
+                    :key="world.worldId"
+                    type="button"
+                    class="group flex w-full items-start gap-3 rounded-lg px-3 py-2 text-left transition-colors hover:bg-accent"
+                    :class="index === 0 ? 'bg-primary/4' : ''"
+                    @click="openWorldDialog(world.worldId)">
+                    <span
+                        class="mt-1 w-5 shrink-0 text-right font-mono text-xs font-bold"
+                        :class="index === 0 ? 'text-primary' : 'text-muted-foreground'">
+                        #{{ index + 1 }}
+                    </span>
+                    <Avatar class="rounded-sm size-8 mt-0.5 shrink-0">
+                        <AvatarImage
+                            v-if="getWorldThumbnail(world.worldId)"
+                            :src="getWorldThumbnail(world.worldId)"
+                            loading="lazy"
+                            decoding="async"
+                            class="rounded-sm object-cover" />
+                        <AvatarFallback class="rounded-sm">
+                            <ImageIcon class="size-3.5 text-muted-foreground" />
+                        </AvatarFallback>
+                    </Avatar>
+                    <div class="min-w-0 flex-1">
+                        <div class="flex items-baseline justify-between gap-2">
+                            <span class="truncate text-sm font-medium">{{ world.worldName }}</span>
+                            <span class="shrink-0 text-xs tabular-nums text-muted-foreground">
+                                {{ formatWorldTime(world.totalTime) }}
+                            </span>
+                        </div>
+                        <div
+                            class="mt-1 h-1.5 w-full overflow-hidden rounded-full"
+                            :class="isDarkMode ? 'bg-white/8' : 'bg-black/6'">
+                            <div
+                                class="h-full rounded-full transition-all duration-500"
+                                :class="isDarkMode ? 'bg-white/45' : 'bg-black/25'"
+                                :style="{ width: getTopWorldBarWidth(world.totalTime) }" />
+                        </div>
+                    </div>
+                </button>
+            </div>
+        </div>
     </div>
 </template>
 
 <script setup>
-    import { computed, h, nextTick, onBeforeUnmount, ref, watch } from 'vue';
+    import { computed, h, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue';
+    import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
     import { Button } from '@/components/ui/button';
     import { DataTableEmpty } from '@/components/ui/data-table';
     import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
     import { Switch } from '@/components/ui/switch';
-    import { RefreshCw, Tractor, Sprout } from 'lucide-vue-next';
+    import { Image as ImageIcon, RefreshCw, Tractor, Sprout } from 'lucide-vue-next';
     import { Spinner } from '@/components/ui/spinner';
     import { storeToRefs } from 'pinia';
     import { toast } from 'vue-sonner';
@@ -138,7 +191,11 @@
 
     import { database } from '../../../services/database';
     import configRepository from '../../../services/config';
+    import { worldRequest } from '../../../api';
     import { useAppearanceSettingsStore, useUserStore } from '../../../stores';
+    import { useWorldStore } from '../../../stores/world';
+    import { showWorldDialog } from '../../../coordinators/worldCoordinator';
+    import { timeToText } from '../../../shared/utils';
     import {
         buildSessionsFromEvents,
         buildSessionsFromGamelog,
@@ -149,8 +206,9 @@
     } from '../../../shared/utils/overlapCalculator';
 
     const { t, locale } = useI18n();
-    const { userDialog } = storeToRefs(useUserStore());
+    const { userDialog, currentUser } = storeToRefs(useUserStore());
     const { isDarkMode, weekStartsOn } = storeToRefs(useAppearanceSettingsStore());
+    const worldStore = useWorldStore();
 
     const chartRef = ref(null);
     const isLoading = ref(false);
@@ -161,6 +219,9 @@
     const selectedPeriod = ref('all');
     const filteredEventCount = ref(0);
 
+    const isSelf = computed(() => userDialog.value.id === currentUser.value.id);
+    const topWorlds = ref([]);
+
     const overlapChartRef = ref(null);
     const isOverlapLoading = ref(false);
     const hasOverlapData = ref(false);
@@ -179,6 +240,7 @@
     let overlapResizeObserver = null;
     let cachedTargetSessions = [];
     let cachedCurrentSessions = [];
+    const pendingWorldThumbnailFetches = new Set();
 
     const dayLabels = computed(() => [
         t('dialog.user.activity.days.sun'),
@@ -229,15 +291,54 @@
         if (cachedTargetSessions.length > 0 && echartsInstance) {
             initChart();
         }
-        updateOverlapChart();
+        if (!isSelf.value) {
+            updateOverlapChart();
+        } else {
+            loadTopWorlds();
+        }
     });
 
+    // Resize echarts when dialog becomes visible again (e.g. breadcrumb return)
+    watch(
+        () => userDialog.value.visible,
+        (visible) => {
+            if (visible) {
+                nextTick(() => {
+                    if (echartsInstance && chartRef.value) {
+                        echartsInstance.resize();
+                    }
+                    if (overlapEchartsInstance && overlapChartRef.value) {
+                        overlapEchartsInstance.resize();
+                    }
+                });
+                if (userDialog.value.activeTab === 'Activity') {
+                    loadOnlineFrequency(userDialog.value.id, 'visible-watch');
+                }
+            }
+        }
+    );
+
+    watch(
+        () => userDialog.value.activeTab,
+        (activeTab) => {
+            if (activeTab === 'Activity' && userDialog.value.visible) {
+                loadOnlineFrequency(userDialog.value.id, 'active-tab-watch');
+            }
+        }
+    );
+
     (async () => {
         excludeHoursEnabled.value = await configRepository.getBool('VRCX_overlapExcludeEnabled', false);
         excludeStartHour.value = await configRepository.getString('VRCX_overlapExcludeStart', '1');
         excludeEndHour.value = await configRepository.getString('VRCX_overlapExcludeEnd', '6');
     })();
 
+    onMounted(() => {
+        if (userDialog.value.visible && userDialog.value.activeTab === 'Activity') {
+            loadOnlineFrequency(userDialog.value.id, 'mounted');
+        }
+    });
+
     onBeforeUnmount(() => {
         disposeChart();
     });
@@ -454,22 +555,34 @@
         const requestId = ++activeRequestId;
         isLoading.value = true;
         try {
-            const [timestamps, events] = await Promise.all([
-                database.getOnlineFrequencyData(userId),
-                database.getOnlineOfflineSessions(userId)
-            ]);
-            if (requestId !== activeRequestId) return;
-            if (userDialog.value.id !== userId) return;
+            if (isSelf.value) {
+                // Self: use gamelog_location for heatmap
+                const rows = await database.getCurrentUserOnlineSessions();
+                if (requestId !== activeRequestId) return;
+                if (userDialog.value.id !== userId) return;
 
-            cachedTimestamps = timestamps;
-            cachedTargetSessions = buildSessionsFromEvents(events);
-            hasAnyData.value = timestamps.length > 0;
-            totalOnlineEvents.value = timestamps.length;
+                cachedTimestamps = rows.map((r) => r.created_at);
+                cachedTargetSessions = buildSessionsFromGamelog(rows);
+            } else {
+                // Friend: use feed_online_offline
+                const [timestamps, events] = await Promise.all([
+                    database.getOnlineFrequencyData(userId),
+                    database.getOnlineOfflineSessions(userId)
+                ]);
+                if (requestId !== activeRequestId) return;
+                if (userDialog.value.id !== userId) return;
+
+                cachedTimestamps = timestamps;
+                cachedTargetSessions = buildSessionsFromEvents(events);
+            }
+
+            hasAnyData.value = cachedTimestamps.length > 0;
+            totalOnlineEvents.value = cachedTimestamps.length;
             lastLoadedUserId = userId;
 
             await nextTick();
 
-            if (timestamps.length > 0) {
+            if (cachedTimestamps.length > 0) {
                 const filteredTs = getFilteredTimestamps();
                 filteredEventCount.value = filteredTs.length;
 
@@ -503,10 +616,12 @@
             }
         }
 
-        // Load overlap data after main data (target sessions already cached)
-        if (hasAnyData.value) {
+        if (hasAnyData.value && !isSelf.value) {
             loadOverlapData(userId);
         }
+        if (hasAnyData.value && isSelf.value) {
+            loadTopWorlds();
+        }
     }
 
     function getFilteredTimestamps() {
@@ -770,5 +885,85 @@
         overlapEchartsInstance.setOption(option, { notMerge: true });
     }
 
+    async function loadTopWorlds() {
+        const days = selectedPeriod.value === 'all' ? 0 : parseInt(selectedPeriod.value, 10);
+        try {
+            topWorlds.value = await database.getMyTopWorlds(days, 5);
+            void fetchMissingTopWorldThumbnails(topWorlds.value);
+        } catch (error) {
+            console.error('Error loading top worlds:', error);
+            topWorlds.value = [];
+        }
+    }
+
+    /**
+     * @param {Array<{worldId: string}>} worlds
+     */
+    async function fetchMissingTopWorldThumbnails(worlds) {
+        const missingWorldIds = worlds
+            .map((world) => world.worldId)
+            .filter((worldId) => {
+                if (!worldId || pendingWorldThumbnailFetches.has(worldId)) {
+                    return false;
+                }
+                return !worldStore.cachedWorlds.get(worldId)?.thumbnailImageUrl;
+            });
+
+        if (missingWorldIds.length === 0) {
+            return;
+        }
+
+        const fetches = missingWorldIds.map(async (worldId) => {
+            pendingWorldThumbnailFetches.add(worldId);
+            try {
+                await worldRequest.getWorld({ worldId });
+            } catch (error) {
+                console.error(`Error fetching missing top world thumbnail for ${worldId}:`, error);
+            } finally {
+                pendingWorldThumbnailFetches.delete(worldId);
+            }
+        });
+
+        await Promise.allSettled(fetches);
+        topWorlds.value = [...topWorlds.value];
+    }
+
+    /**
+     * @param {string} worldId
+     * @returns {string|null}
+     */
+    function getWorldThumbnail(worldId) {
+        const cached = worldStore.cachedWorlds.get(worldId);
+        if (!cached?.thumbnailImageUrl) return null;
+        return cached.thumbnailImageUrl.replace('256', '128');
+    }
+
+    /**
+     * @param {string} worldId
+     */
+    function openWorldDialog(worldId) {
+        showWorldDialog(worldId);
+    }
+
+    /**
+     * @param {number} ms
+     * @returns {string}
+     */
+    function formatWorldTime(ms) {
+        if (!ms || ms <= 0) return '0m';
+        return timeToText(ms);
+    }
+
+    /**
+     * @param {number} totalTime
+     * @returns {string}
+     */
+    function getTopWorldBarWidth(totalTime) {
+        if (topWorlds.value.length === 0) return '0%';
+        const maxTime = topWorlds.value[0].totalTime;
+        if (maxTime <= 0) return '0%';
+        return `${Math.round((totalTime / maxTime) * 100)}%`;
+    }
+
     defineExpose({ loadOnlineFrequency });
 </script>
diff --git a/src/localization/en.json b/src/localization/en.json
index ce18f71f..2c492fe7 100644
--- a/src/localization/en.json
+++ b/src/localization/en.json
@@ -1455,6 +1455,9 @@
                     "exclude_hours": "Exclude hours",
                     "no_data": "Not enough data to calculate overlap",
                     "times_overlap": "times overlapping"
+                },
+                "most_visited_worlds": {
+                    "header": "Most Visited Worlds"
                 }
             },
             "note_memo": {
diff --git a/src/services/database/gameLog.js b/src/services/database/gameLog.js
index 03a4ddf0..35cee3a8 100644
--- a/src/services/database/gameLog.js
+++ b/src/services/database/gameLog.js
@@ -1380,13 +1380,52 @@ const gameLog = {
      */
     async getCurrentUserOnlineSessions() {
         const data = [];
+        await sqliteService.execute((dbRow) => {
+            data.push({ created_at: dbRow[0], time: dbRow[1] || 0 });
+        }, `SELECT created_at, time FROM gamelog_location ORDER BY created_at`);
+        return data;
+    },
+
+    /**
+     * Get current user's top visited worlds from gamelog_location.
+     * Groups by world_id and aggregates visit count and total time.
+     * @param {number} [days] - Number of days to look back. Omit or 0 for all time.
+     * @param {number} [limit=5] - Maximum number of worlds to return.
+     * @returns {Promise<Array<{worldId: string, worldName: string, visitCount: number, totalTime: number}>>}
+     */
+    async getMyTopWorlds(days = 0, limit = 5) {
+        const results = [];
+        const whereClause =
+            days > 0 ? `AND created_at >= datetime('now', @daysOffset)` : '';
+        const params = { '@limit': limit };
+        if (days > 0) {
+            params['@daysOffset'] = `-${days} days`;
+        }
         await sqliteService.execute(
             (dbRow) => {
-                data.push({ created_at: dbRow[0], time: dbRow[1] || 0 });
+                results.push({
+                    worldId: dbRow[0],
+                    worldName: dbRow[1] || dbRow[0],
+                    visitCount: dbRow[2],
+                    totalTime: dbRow[3] || 0
+                });
             },
-            `SELECT created_at, time FROM gamelog_location ORDER BY created_at`
+            `SELECT
+                world_id,
+                world_name,
+                COUNT(*) AS visit_count,
+                SUM(time) AS total_time
+            FROM gamelog_location
+            WHERE world_id IS NOT NULL
+                AND world_id != ''
+                AND world_id LIKE 'wrld_%'
+                ${whereClause}
+            GROUP BY world_id
+            ORDER BY total_time DESC
+            LIMIT @limit`,
+            params
         );
-        return data;
+        return results;
     },
 
     async getUserIdFromDisplayName(displayName) {