diff --git a/client/components/app/BookShelfCategorized.vue b/client/components/app/BookShelfCategorized.vue
index 2335d040..3fcc7df9 100644
--- a/client/components/app/BookShelfCategorized.vue
+++ b/client/components/app/BookShelfCategorized.vue
@@ -91,7 +91,7 @@ export default {
     },
     async fetchCategories() {
       var categories = await this.$axios
-        .$get(`/api/libraries/${this.currentLibraryId}/personalized?minified=1`)
+        .$get(`/api/libraries/${this.currentLibraryId}/personalized`)
         .then((data) => {
           return data
         })
diff --git a/client/components/cards/LazySeriesCard.vue b/client/components/cards/LazySeriesCard.vue
index fba2ef8c..a84a8e9b 100644
--- a/client/components/cards/LazySeriesCard.vue
+++ b/client/components/cards/LazySeriesCard.vue
@@ -61,6 +61,9 @@ export default {
     books() {
       return this.series ? this.series.books || [] : []
     },
+    addedAt() {
+      return this.series ? this.series.addedAt : 0
+    },
     seriesBookProgress() {
       return this.books
         .map((libraryItem) => {
diff --git a/server/controllers/LibraryController.js b/server/controllers/LibraryController.js
index f38be128..db6e139c 100644
--- a/server/controllers/LibraryController.js
+++ b/server/controllers/LibraryController.js
@@ -293,12 +293,25 @@ class LibraryController {
   }
 
   // api/libraries/:id/personalized
+  // New and improved personalized call only loops through library items once
+  async getLibraryUserPersonalizedOptimal(req, res) {
+    const mediaType = req.library.mediaType
+    const libraryItems = req.libraryItems
+    const limitPerShelf = req.query.limit && !isNaN(req.query.limit) ? Number(req.query.limit) : 10
+
+    const categories = libraryHelpers.buildPersonalizedShelves(req.user, libraryItems, mediaType, this.db.series, this.db.authors, limitPerShelf)
+    res.json(categories)
+  }
+
+  // TODO: Remove old personalized function with all its helper functions
+  //          old personalized function looped through the library items many times
+  // api/libraries/:id/personalized-old
   async getLibraryUserPersonalized(req, res) {
     var mediaType = req.library.mediaType
     var isPodcastLibrary = mediaType == 'podcast'
     var libraryItems = req.libraryItems
     var limitPerShelf = req.query.limit && !isNaN(req.query.limit) ? Number(req.query.limit) : 12
-    var minified = req.query.minified === '1'
+    var minified = req.query.minified == '1'
 
     var itemsWithUserProgress = libraryHelpers.getMediaProgressWithItems(req.user, libraryItems)
     var categories = [
@@ -324,7 +337,6 @@ class LibraryController {
       return cats.entities.length
     })
 
-
     // New Series section
     //  TODO: optimize and move to libraryHelpers
     if (!isPodcastLibrary) {
diff --git a/server/routers/ApiRouter.js b/server/routers/ApiRouter.js
index 8ea23398..217c9bb6 100644
--- a/server/routers/ApiRouter.js
+++ b/server/routers/ApiRouter.js
@@ -60,7 +60,8 @@ class ApiRouter {
     this.router.get('/libraries/:id/items', LibraryController.middleware.bind(this), LibraryController.getLibraryItems.bind(this))
     this.router.get('/libraries/:id/series', LibraryController.middleware.bind(this), LibraryController.getAllSeriesForLibrary.bind(this))
     this.router.get('/libraries/:id/collections', LibraryController.middleware.bind(this), LibraryController.getCollectionsForLibrary.bind(this))
-    this.router.get('/libraries/:id/personalized', LibraryController.middleware.bind(this), LibraryController.getLibraryUserPersonalized.bind(this))
+    this.router.get('/libraries/:id/personalized-old', LibraryController.middleware.bind(this), LibraryController.getLibraryUserPersonalized.bind(this))
+    this.router.get('/libraries/:id/personalized', LibraryController.middleware.bind(this), LibraryController.getLibraryUserPersonalizedOptimal.bind(this))
     this.router.get('/libraries/:id/filterdata', LibraryController.middleware.bind(this), LibraryController.getLibraryFilterData.bind(this))
     this.router.get('/libraries/:id/search', LibraryController.middleware.bind(this), LibraryController.search.bind(this))
     this.router.get('/libraries/:id/stats', LibraryController.middleware.bind(this), LibraryController.stats.bind(this))
diff --git a/server/utils/libraryHelpers.js b/server/utils/libraryHelpers.js
index ffe49223..9f3406c2 100644
--- a/server/utils/libraryHelpers.js
+++ b/server/utils/libraryHelpers.js
@@ -350,5 +350,313 @@ module.exports = {
       }
       return libraryItemJson
     }).filter(li => li)
+  },
+
+  buildPersonalizedShelves(user, libraryItems, mediaType, allSeries, allAuthors, maxEntitiesPerShelf = 10) {
+    const isPodcastLibrary = mediaType === 'podcast'
+
+
+    const shelves = [
+      {
+        id: 'continue-listening',
+        label: 'Continue Listening',
+        type: isPodcastLibrary ? 'episode' : mediaType,
+        entities: [],
+        category: 'recentlyListened'
+      },
+      {
+        id: 'recently-added',
+        label: 'Recently Added',
+        type: mediaType,
+        entities: [],
+        category: 'newestItems'
+      },
+      {
+        id: 'listen-again',
+        label: 'Listen Again',
+        type: isPodcastLibrary ? 'episode' : mediaType,
+        entities: [],
+        category: 'recentlyFinished'
+      },
+      {
+        id: 'recent-series',
+        label: 'Recent Series',
+        type: 'series',
+        entities: [],
+        category: 'newestSeries'
+      },
+      {
+        id: 'newest-authors',
+        label: 'Newest Authors',
+        type: 'authors',
+        entities: [],
+        category: 'newestAuthors'
+      },
+      {
+        id: 'episodes-recently-added',
+        label: 'Newest Episodes',
+        type: 'episode',
+        entities: [],
+        category: 'newestEpisodes'
+      }
+    ]
+
+    const categories = ['recentlyListened', 'newestEpisodes', 'newestItems', 'newestSeries', 'recentlyFinished', 'newestAuthors']
+    const categoryMap = {}
+    categories.forEach((cat) => {
+      categoryMap[cat] = {
+        category: cat,
+        biggest: 0,
+        smallest: 0,
+        items: []
+      }
+    })
+
+    const seriesMap = {}
+    const authorMap = {}
+
+    for (const libraryItem of libraryItems) {
+      if (libraryItem.addedAt > categoryMap.newestItems.smallest) {
+
+        var indexToPut = categoryMap.newestItems.items.findIndex(i => libraryItem.addedAt > i.addedAt)
+        if (indexToPut >= 0) {
+          categoryMap.newestItems.items.splice(indexToPut, 0, libraryItem.toJSONMinified())
+        } else {
+          categoryMap.newestItems.items.push(libraryItem.toJSONMinified())
+        }
+
+        if (categoryMap.newestItems.items.length > maxEntitiesPerShelf) {
+          // Remove last item
+          categoryMap.newestItems.items.pop()
+          categoryMap.newestItems.smallest = categoryMap.newestItems.items[categoryMap.newestItems.items.length - 1].addedAt
+        }
+        categoryMap.newestItems.biggest = categoryMap.newestItems.items[0].addedAt
+      }
+
+      var allItemProgress = user.getAllMediaProgressForLibraryItem(libraryItem.id)
+      if (libraryItem.isPodcast) {
+        // Podcast categories
+        const podcastEpisodes = libraryItem.media.episodes || []
+        for (const episode of podcastEpisodes) {
+          // Newest episodes
+          if (episode.addedAt > categoryMap.newestEpisodes.smallest) {
+            const libraryItemWithEpisode = {
+              ...libraryItem.toJSONMinified(),
+              recentEpisode: episode.toJSON()
+            }
+
+            var indexToPut = categoryMap.newestEpisodes.items.findIndex(i => episode.addedAt > i.recentEpisode.addedAt)
+            if (indexToPut >= 0) {
+              categoryMap.newestEpisodes.items.splice(indexToPut, 0, libraryItemWithEpisode)
+            } else {
+              categoryMap.newestEpisodes.items.push(libraryItemWithEpisode)
+            }
+
+            if (categoryMap.newestEpisodes.items.length > maxEntitiesPerShelf) {
+              // Remove last item
+              categoryMap.newestEpisodes.items.pop()
+              categoryMap.newestEpisodes.smallest = categoryMap.newestEpisodes.items[categoryMap.newestEpisodes.items.length - 1].recentEpisode.addedAt
+            }
+            categoryMap.newestEpisodes.biggest = categoryMap.newestEpisodes.items[0].recentEpisode.addedAt
+          }
+
+          // Episode recently listened and finished
+          var mediaProgress = allItemProgress.find(mp => mp.episodeId === episode.id)
+          if (mediaProgress) {
+            if (mediaProgress.isFinished) {
+              if (mediaProgress.finishedAt > categoryMap.recentlyFinished.smallest) { // Item belongs on shelf
+                const libraryItemWithEpisode = {
+                  ...libraryItem.toJSONMinified(),
+                  recentEpisode: episode.toJSON(),
+                  finishedAt: mediaProgress.finishedAt
+                }
+
+                var indexToPut = categoryMap.recentlyFinished.items.findIndex(i => mediaProgress.finishedAt > i.finishedAt)
+                if (indexToPut >= 0) {
+                  categoryMap.recentlyFinished.items.splice(indexToPut, 0, libraryItemWithEpisode)
+                } else {
+                  categoryMap.recentlyFinished.items.push(libraryItemWithEpisode)
+                }
+
+                if (categoryMap.recentlyFinished.items.length > maxEntitiesPerShelf) {
+                  // Remove last item
+                  categoryMap.recentlyFinished.items.pop()
+                  categoryMap.recentlyFinished.smallest = categoryMap.recentlyFinished.items[categoryMap.recentlyFinished.items.length - 1].finishedAt
+                }
+                categoryMap.recentlyFinished.biggest = categoryMap.recentlyFinished.items[0].finishedAt
+              }
+            } else if (mediaProgress.progress > 0) { // Handle most recently listened
+              if (mediaProgress.lastUpdate > categoryMap.recentlyListened.smallest) { // Item belongs on shelf
+                const libraryItemWithEpisode = {
+                  ...libraryItem.toJSONMinified(),
+                  recentEpisode: episode.toJSON(),
+                  progressLastUpdate: mediaProgress.lastUpdate
+                }
+
+                var indexToPut = categoryMap.recentlyListened.items.findIndex(i => mediaProgress.lastUpdate > i.progressLastUpdate)
+                if (indexToPut >= 0) {
+                  categoryMap.recentlyListened.items.splice(indexToPut, 0, libraryItemWithEpisode)
+                } else {
+                  categoryMap.recentlyListened.items.push(libraryItemWithEpisode)
+                }
+
+                if (categoryMap.recentlyListened.items.length > maxEntitiesPerShelf) {
+                  // Remove last item
+                  categoryMap.recentlyListened.items.pop()
+                  categoryMap.recentlyListened.smallest = categoryMap.recentlyListened.items[categoryMap.recentlyListened.items.length - 1].progressLastUpdate
+                }
+
+                categoryMap.recentlyListened.biggest = categoryMap.recentlyListened.items[0].progressLastUpdate
+              }
+            }
+          }
+        }
+      } else {
+        // Book categories
+
+        // Newest series
+        if (libraryItem.media.metadata.series.length) {
+          for (const librarySeries of libraryItem.media.metadata.series) {
+
+            if (!seriesMap[librarySeries.id]) {
+              const seriesObj = allSeries.find(se => se.id === librarySeries.id)
+              if (seriesObj) {
+                var series = {
+                  ...seriesObj.toJSON(),
+                  books: []
+                }
+
+                if (series.addedAt > categoryMap.newestSeries.smallest) {
+                  const libraryItemJson = libraryItem.toJSONMinified()
+                  libraryItemJson.seriesSequence = librarySeries.sequence
+                  series.books.push(libraryItemJson)
+
+                  var indexToPut = categoryMap.newestSeries.items.findIndex(i => series.addedAt > i.addedAt)
+                  if (indexToPut >= 0) {
+                    categoryMap.newestSeries.items.splice(indexToPut, 0, series)
+                  } else {
+                    categoryMap.newestSeries.items.push(series)
+                  }
+
+                  // Max series is 5
+                  if (categoryMap.newestSeries.items.length > 5) {
+                    categoryMap.newestSeries.items.pop()
+                    categoryMap.newestSeries.smallest = categoryMap.newestSeries.items[categoryMap.newestSeries.items.length - 1].addedAt
+                  }
+
+                  categoryMap.newestSeries.biggest = categoryMap.newestSeries.items[0].addedAt
+
+                  seriesMap[librarySeries.id] = series
+                }
+              }
+            } else {
+              // series already in map - add book
+              const libraryItemJson = libraryItem.toJSONMinified()
+              libraryItemJson.seriesSequence = librarySeries.sequence
+              seriesMap[librarySeries.id].books.push(libraryItemJson)
+            }
+          }
+        }
+
+        // Newest authors
+        if (libraryItem.media.metadata.authors.length) {
+          for (const libraryAuthor of libraryItem.media.metadata.authors) {
+            if (!authorMap[libraryAuthor.id]) {
+              const authorObj = allAuthors.find(au => au.id === libraryAuthor.id)
+              if (authorObj) {
+                var author = {
+                  ...authorObj.toJSON(),
+                  numBooks: 1
+                }
+
+                if (author.addedAt > categoryMap.newestAuthors.smallest) {
+
+                  var indexToPut = categoryMap.newestAuthors.items.findIndex(i => author.addedAt > i.addedAt)
+                  if (indexToPut >= 0) {
+                    categoryMap.newestAuthors.items.splice(indexToPut, 0, author)
+                  } else {
+                    categoryMap.newestAuthors.items.push(author)
+                  }
+
+                  // Max authors is 10
+                  if (categoryMap.newestAuthors.items.length > 10) {
+                    categoryMap.newestAuthors.items.pop()
+                    categoryMap.newestAuthors.smallest = categoryMap.newestAuthors.items[categoryMap.newestAuthors.items.length - 1].addedAt
+                  }
+
+                  categoryMap.newestAuthors.biggest = categoryMap.newestAuthors.items[0].addedAt
+                }
+
+                authorMap[libraryAuthor.id] = author
+              }
+            } else {
+              authorMap[libraryAuthor.id].numBooks++
+            }
+          }
+        }
+
+        // Book listening and finished
+        var mediaProgress = allItemProgress.length ? allItemProgress[0] : null
+        if (mediaProgress) {
+          // Handle most recently finished
+          if (mediaProgress.isFinished) {
+            if (mediaProgress.finishedAt > categoryMap.recentlyFinished.smallest) { // Item belongs on shelf
+              const libraryItemObj = {
+                ...libraryItem.toJSONMinified(),
+                finishedAt: mediaProgress.finishedAt
+              }
+
+              var indexToPut = categoryMap.recentlyFinished.items.findIndex(i => mediaProgress.finishedAt > i.finishedAt)
+              if (indexToPut >= 0) {
+                categoryMap.recentlyFinished.items.splice(indexToPut, 0, libraryItemObj)
+              } else {
+                categoryMap.recentlyFinished.items.push(libraryItemObj)
+              }
+              if (categoryMap.recentlyFinished.items.length > maxEntitiesPerShelf) {
+                // Remove last item
+                categoryMap.recentlyFinished.items.pop()
+                categoryMap.recentlyFinished.smallest = categoryMap.recentlyFinished.items[categoryMap.recentlyFinished.items.length - 1].finishedAt
+              }
+              categoryMap.recentlyFinished.biggest = categoryMap.recentlyFinished.items[0].finishedAt
+            }
+          } else if (mediaProgress.inProgress) { // Handle most recently listened
+            if (mediaProgress.lastUpdate > categoryMap.recentlyListened.smallest) { // Item belongs on shelf
+              const libraryItemObj = {
+                ...libraryItem.toJSONMinified(),
+                progressLastUpdate: mediaProgress.lastUpdate
+              }
+
+              var indexToPut = categoryMap.recentlyListened.items.findIndex(i => mediaProgress.lastUpdate > i.progressLastUpdate)
+              if (indexToPut >= 0) {
+                categoryMap.recentlyListened.items.splice(indexToPut, 0, libraryItemObj)
+              } else { // Should only happen when array is < max
+                categoryMap.recentlyListened.items.push(libraryItemObj)
+              }
+              if (categoryMap.recentlyListened.items.length > maxEntitiesPerShelf) {
+                // Remove last item
+                categoryMap.recentlyListened.items.pop()
+                categoryMap.recentlyListened.smallest = categoryMap.recentlyListened.items[categoryMap.recentlyListened.items.length - 1].progressLastUpdate
+              }
+              categoryMap.recentlyListened.biggest = categoryMap.recentlyListened.items[0].progressLastUpdate
+            }
+          }
+        }
+      }
+    }
+
+    // Sort series books by sequence
+    if (categoryMap.newestSeries.items.length) {
+      for (const seriesItem of categoryMap.newestSeries.items) {
+        seriesItem.books = naturalSort(seriesItem.books).asc(li => li.seriesSequence)
+      }
+    }
+
+    var categoriesWithItems = Object.values(categoryMap).filter(cat => cat.items.length)
+
+    return categoriesWithItems.map(cat => {
+      var shelf = shelves.find(s => s.category === cat.category)
+      shelf.entities = cat.items
+      return shelf
+    })
   }
 }
\ No newline at end of file