diff --git a/plugin-designs/pplr-data-maps/src/utils/pplrData.js b/plugin-designs/pplr-data-maps/src/utils/pplrData.js
index c65c9a130..862cfdd39 100644
--- a/plugin-designs/pplr-data-maps/src/utils/pplrData.js
+++ b/plugin-designs/pplr-data-maps/src/utils/pplrData.js
@@ -104,8 +104,10 @@ export function setProjectionFor(map, name) {
 // Verification handle (the gospel-resources __grState contract): what the ACTIVE view's map
 // actually did, so a check can assert "loaded" rather than inferring it from missing requests.
 // window.__pplrMap() -> { engine, loaded, styleLayers, pplrLayers }
+let _exposedMap = null   // whose hook is on window, so releaseMap only clears its own
 export function exposeMap(map) {
   if (typeof window === 'undefined' || !map) return
+  _exposedMap = map
   let loaded = false
   map.once('load', () => { loaded = true })
   window.__pplrMap = () => {
@@ -123,3 +125,11 @@ export function exposeMap(map) {
     }
   }
 }
+
+// Release the hook on unmount (a closure on window pins the whole app after the view is gone; rega
+// measured ~10 MB per mount). Only if it is still THIS map's: another view may have exposed its own since.
+export function releaseMap(map) {
+  if (typeof window === 'undefined' || !map || _exposedMap !== map) return
+  delete window.__pplrMap
+  _exposedMap = null
+}
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-coverage.vue b/plugin-designs/pplr-data-maps/src/views/pplr-coverage.vue
index 6936aa2f2..7bea016a9 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-coverage.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-coverage.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { dataUrl, glFor, exposeMap, whenGeojsonDrawn } from '../utils/pplrData.js'
+import { dataUrl, glFor, exposeMap, releaseMap, whenGeojsonDrawn } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { formatCount } from '@map/utils/formatCount.js'   // counts stay fixed en-US: numerals are held for the Driver
 import { tStatic } from '@map/i18n/index.js'
@@ -79,7 +79,7 @@ onMounted(async () => {
       map.value.getSource(sourceId).setData(fc)
       // Verification handle (the gospel-resources __grState contract): how many country
       // polygons found a coverage row. A key mismatch paints every country the "no data" grey.
-      if (typeof window !== 'undefined') window.__pplrCoverage = () => ({
+      if (typeof window !== 'undefined') window.__pplrCoverage = _coverageHook = () => ({
         polygons: fc.features.length,
         matched: fc.features.filter(f => f.properties.avgFilled != null).length,
         sampleUnmatched: fc.features.filter(f => f.properties.avgFilled == null).slice(0, 5).map(f => f.properties.GENCalpha3),
@@ -136,7 +136,13 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => destroy())
+let _coverageHook = null
+onBeforeUnmount(() => {
+  releaseMap(map.value)
+  // Release this view's own hook too (only if it is still ours).
+  if (typeof window !== 'undefined' && window.__pplrCoverage === _coverageHook) delete window.__pplrCoverage
+  destroy()
+})
 
 const SCALE = [
   { stop: '0',  color: '#7f1d1d', label: '0 locales' },
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-language-families.vue b/plugin-designs/pplr-data-maps/src/views/pplr-language-families.vue
index e1041da75..cddb7e3e0 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-language-families.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-language-families.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { dataUrl, glFor, exposeMap, whenGeojsonDrawn, setProjectionFor } from '../utils/pplrData.js'
+import { dataUrl, glFor, exposeMap, releaseMap, whenGeojsonDrawn, setProjectionFor } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { useOptionalT } from '@map/composables/useOptionalT.js'
 import { tStatic } from '@map/i18n/index.js'
@@ -515,7 +515,7 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => { pinIndicator.destroy(); destroy() })
+onBeforeUnmount(() => { releaseMap(map.value); pinIndicator.destroy(); destroy() })
 
 const LF_CSS = POPUP_CSS + `
 .pplr-popup h3 small { display: block; font-weight: 400; color: #6b7280; font-size: 11px; margin-top: 2px; }
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-pins.vue b/plugin-designs/pplr-data-maps/src/views/pplr-pins.vue
index 62dcaa18b..2ed4274de 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-pins.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-pins.vue
@@ -5,7 +5,7 @@
  * Individual pins at all zoom levels; click pin for full Rosetta popup; hover country for highlight.
  */
 import { inject, onMounted, onBeforeUnmount, ref } from 'vue'
-import { glFor, exposeMap, whenGeojsonDrawn } from '../utils/pplrData.js'
+import { glFor, exposeMap, releaseMap, whenGeojsonDrawn } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { formatCount } from '@map/utils/formatCount.js'   // counts stay fixed en-US: numerals are held for the Driver
 import { tStatic } from '@map/i18n/index.js'
@@ -68,7 +68,7 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => destroy())
+onBeforeUnmount(() => { releaseMap(map.value); destroy() })
 </script>
 
 <template>
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-religion.vue b/plugin-designs/pplr-data-maps/src/views/pplr-religion.vue
index e9a6a4959..99582fc27 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-religion.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-religion.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { dataUrl, glFor, exposeMap, whenGeojsonDrawn, setProjectionFor } from '../utils/pplrData.js'
+import { dataUrl, glFor, exposeMap, releaseMap, whenGeojsonDrawn, setProjectionFor } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { religionFamilyLabel } from '@map/colors/religion.js'
 import { tStatic } from '@map/i18n/index.js'
@@ -296,7 +296,7 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => { pinIndicator.destroy(); destroy() })
+onBeforeUnmount(() => { releaseMap(map.value); pinIndicator.destroy(); destroy() })
 
 const REL_CSS = POPUP_CSS + `
 .pplr-popup h3 small { display: block; font-weight: 400; color: #6b7280; font-size: 11px; margin-top: 2px; }
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-rop-tree.vue b/plugin-designs/pplr-data-maps/src/views/pplr-rop-tree.vue
index b295dcba5..f7e05e78a 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-rop-tree.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-rop-tree.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { dataUrl, glFor, exposeMap, setProjectionFor } from '../utils/pplrData.js'
+import { dataUrl, glFor, exposeMap, releaseMap, setProjectionFor } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { useOptionalT } from '@map/composables/useOptionalT.js'
 import { tStatic } from '@map/i18n/index.js'
@@ -482,7 +482,7 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => { pinIndicator.destroy(); destroy() })
+onBeforeUnmount(() => { releaseMap(map.value); pinIndicator.destroy(); destroy() })
 
 const TREE_POPUP_CSS = POPUP_CSS + `
 .pplr-popup h3 small { display: block; color: #6b7280; font-weight: 400; font-size: 11px; margin-top: 2px; }
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-rosetta-cards.vue b/plugin-designs/pplr-data-maps/src/views/pplr-rosetta-cards.vue
index cd4b9c44d..64904116f 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-rosetta-cards.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-rosetta-cards.vue
@@ -13,7 +13,7 @@
  * Click any pin → popup with full Rosetta table.
  */
 import { inject, onMounted, onBeforeUnmount, ref, computed } from 'vue'
-import { glFor, exposeMap, whenGeojsonDrawn } from '../utils/pplrData.js'
+import { glFor, exposeMap, releaseMap, whenGeojsonDrawn } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { tStatic } from '@map/i18n/index.js'
 import { useMapInstance } from '@map/composables/useMapInstance.js'
@@ -158,7 +158,7 @@ onMounted(async () => {
     }
   })
 })
-onBeforeUnmount(() => destroy())
+onBeforeUnmount(() => { releaseMap(map.value); destroy() })
 
 const LEGEND = computed(() => [
   { color: '#fbbf24', label: t('pplr.rosetta.legend.all') },
diff --git a/plugin-designs/pplr-data-maps/src/views/pplr-translations.vue b/plugin-designs/pplr-data-maps/src/views/pplr-translations.vue
index b9492017b..893798d32 100644
--- a/plugin-designs/pplr-data-maps/src/views/pplr-translations.vue
+++ b/plugin-designs/pplr-data-maps/src/views/pplr-translations.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { dataUrl, glFor, exposeMap, whenGeojsonDrawn } from '../utils/pplrData.js'
+import { dataUrl, glFor, exposeMap, releaseMap, whenGeojsonDrawn } from '../utils/pplrData.js'
 import { usePplrT } from '../composables/usePplrT.js'
 import { tStatic } from '@map/i18n/index.js'
 /**
@@ -110,7 +110,7 @@ onMounted(async () => {
   })
 })
 
-onBeforeUnmount(() => { pinIndicator.destroy(); destroy() })
+onBeforeUnmount(() => { releaseMap(map.value); pinIndicator.destroy(); destroy() })
 </script>
 
 <template>