diff --git a/apps/client/src/stores/dataStores/datasetSelectionUntrrackedStore.ts b/apps/client/src/stores/dataStores/datasetSelectionUntrrackedStore.ts
index f6d76e86..58ee30c2 100644
--- a/apps/client/src/stores/dataStores/datasetSelectionUntrrackedStore.ts
+++ b/apps/client/src/stores/dataStores/datasetSelectionUntrrackedStore.ts
@@ -28,8 +28,13 @@ export interface ExperimentMetadata {
     // can precompute min/max for each column across experiments
     locationMetadataList: LocationMetadata[];
     compositeTabularDataFilename?: string;
+    // how the segmentation files are saved
+    // split by cell (default), split by frame
+    segmentationGrouping?: SegmentationGroupingOptions;
 }
 
+export type SegmentationGroupingOptions = 'CellFiles' | 'FrameFiles';
+
 export type Tags = Record<string, string>;
 
 export interface LocationMetadata {
@@ -81,6 +86,14 @@ export const useDatasetSelectionStore = defineStore(
             return null;
         });
 
+        const segmentationGrouping = computed<SegmentationGroupingOptions>(() => {
+            // TODO: calc based on currentExperimentMetadata
+            if (!currentExperimentMetadata.value) {
+                return 'CellFiles'
+            }
+            return currentExperimentMetadata.value.segmentationGrouping ?? 'CellFiles';
+        })
+
         // Generate Experiment List
         const experimentFilenameList = asyncComputed<string[]>(async () => {
             if (configStore.serverUrl == null) return null;
@@ -406,6 +419,7 @@ export const useDatasetSelectionStore = defineStore(
             compTableName,
             aggTableName,
             shownSelectedLocationIds,
+            segmentationGrouping,
         };
     }
 );
diff --git a/apps/client/src/stores/dataStores/segmentationStore.ts b/apps/client/src/stores/dataStores/segmentationStore.ts
index 426124c0..09ebc375 100644
--- a/apps/client/src/stores/dataStores/segmentationStore.ts
+++ b/apps/client/src/stores/dataStores/segmentationStore.ts
@@ -6,15 +6,10 @@ import {
     type Track,
 } from '@/stores/dataStores/cellMetaDataStore';
 import { useDatasetSelectionStore } from '@/stores/dataStores/datasetSelectionUntrrackedStore';
-import type { Feature } from 'geojson';
+import type { Feature, FeatureCollection } from 'geojson';
 import { LRUCache } from 'lru-cache';
 import { useConfigStore } from '../misc/configStore';
 
-
-// interface LocationSegmentations {
-//     location: string,
-//     segmentations: Feature[];
-// }
 /**
  * Custom store for managing segmentations.
  * @returns An object containing functions to retrieve segmentations.
@@ -23,14 +18,18 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
     const datasetSelectionStore = useDatasetSelectionStore();
     const cellMetaData = useCellMetaData();
     const configStore = useConfigStore();
+    const filesGroupedByFrame = computed(() => datasetSelectionStore.segmentationGrouping === 'FrameFiles');
+
     const cache = ref(
-        new LRUCache<string, Feature>({
-            max: 25_000,
+        new LRUCache<string, Feature | FeatureCollection>({
+            // TODO: this max for the cache is probably too large if we are saving frames.
+            // could use diff max depending on if we are grabbing from frames vs. cells.
+            max: filesGroupedByFrame.value ? 500 : 25_000,
             // each item is small (1-2 KB)
             fetchMethod: async (jsonUrl, staleValue, { signal }) => {
                 return (await fetch(jsonUrl, { signal }).then((res) =>
                     res.json()
-                )) as Feature;
+                )) as Feature | FeatureCollection;
             },
         })
     );
@@ -40,7 +39,12 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
      * @returns An array of GeoJson features representing the segmentations.
      */
     async function getFrameSegmentations(frame: number): Promise<Feature[]> {
-        // Implementation goes here
+        if (filesGroupedByFrame.value) {
+            const featureCollection = (await cache.value.fetch(
+                `${segmentationFolderUrl.value}/${frame}.json`
+            )) as FeatureCollection;
+            return featureCollection.features;
+        }
         const cells = cellMetaData.frameMap.get(frame);
         if (!cells) return [];
         const promises = cells.map((cell) => getCellSegmentation(cell));
@@ -49,15 +53,6 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
         ) as Feature[];
     }
 
-    // /**
-    //  * Get segmentations for a specific track.
-    //  * @param track - The track object.
-    //  * @returns An array of GeoJson features representing the segmentations.
-    //  */
-    // async function getTrackSegmentations(track: Track): Promise<Feature[]> {
-    //     // Implementation goes here
-    // }
-
     const segmentationFolderUrl = computed<string>(() => {
         if (
             datasetSelectionStore.currentLocationMetadata
@@ -71,21 +66,20 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
         return url;
     });
 
-    async function getCellLocationSegmentations(
-        cells: Cell[]
-    ): Promise<Feature[] | undefined> {
-        const promises = cells.map((cell) => getCellSegmentation(cell));
-        return (await Promise.all(promises)).filter(
-            (x) => x != null
-        ) as Feature[];
-    }
-
     // Based on the frame, the id, and the location, return the feature (segmentation)
-    async function getCellLocationSegmentation (frame: string, trackId: string, location: string): Promise<Feature | undefined> {
+    async function getCellLocationSegmentation(frame: string, trackId: string, location: string): Promise<Feature | undefined> {
         const locationSegmentationUrl = configStore.getFileUrl(datasetSelectionStore.getLocationMetadata(location)?.segmentationsFolder || '');
-        return await cache.value.fetch(
+        if (filesGroupedByFrame.value) {
+            const featureCollection = (await cache.value.fetch(
+                `${locationSegmentationUrl}/${frame}.json`
+            )) as FeatureCollection;
+            return featureCollection.features.find(
+                (feature) => feature.properties?.id.toString() === trackId.toString()
+            );
+        }
+        return (await cache.value.fetch(
             `${locationSegmentationUrl}/cells/${frame}-${trackId}.json`
-        );
+        )) as Feature;
     }
 
     /**
@@ -98,9 +92,17 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
     ): Promise<Feature | undefined> {
         const frame = cellMetaData.getFrame(cell);
         const id = cell.trackId;
-        return await cache.value.fetch(
+        if (filesGroupedByFrame.value) {
+            const featureCollection = (await cache.value.fetch(
+                `${segmentationFolderUrl.value}/${frame}.json`
+            )) as FeatureCollection;
+            return featureCollection.features.find(
+                (feature) => feature.properties?.id.toString() === id.toString()
+            );
+        }
+        return (await cache.value.fetch(
             `${segmentationFolderUrl.value}/cells/${frame}-${id}.json`
-        );
+        )) as Feature;
     }
 
     async function getCellSegmentations(
@@ -115,8 +117,6 @@ export const useSegmentationStore = defineStore('segmentationStore', () => {
     return {
         getFrameSegmentations,
         getCellLocationSegmentation,
-        getCellLocationSegmentations,
-        // getTrackSegmentations,
         getCellSegmentation,
         getCellSegmentations,
     };