diff --git a/x-pack/plugins/ml/public/application/components/field_stats_flyout/field_stats_flyout_provider.tsx b/x-pack/plugins/ml/public/application/components/field_stats_flyout/field_stats_flyout_provider.tsx
index f72fb8d00f173..02c1a2c70aa92 100644
--- a/x-pack/plugins/ml/public/application/components/field_stats_flyout/field_stats_flyout_provider.tsx
+++ b/x-pack/plugins/ml/public/application/components/field_stats_flyout/field_stats_flyout_provider.tsx
@@ -76,7 +76,7 @@ export const FieldStatsFlyoutProvider: FC<{
           fields: ['*'],
           _source: false,
           ...queryAndRunTimeMappings,
-          size: 1000,
+          size: 500,
         },
       };
       const cacheKey = stringHash(JSON.stringify(esSearchRequestParams)).toString();
diff --git a/x-pack/plugins/ml/public/shared.ts b/x-pack/plugins/ml/public/shared.ts
index 73688aebc94f8..57db3c66a7c3b 100644
--- a/x-pack/plugins/ml/public/shared.ts
+++ b/x-pack/plugins/ml/public/shared.ts
@@ -16,3 +16,5 @@ export * from '../common/util/validators';
 export * from './application/formatters/metric_change_description';
 export * from './application/components/field_stats_flyout';
 export * from './application/data_frame_analytics/common';
+
+export { useFieldStatsFlyoutContext } from './application/components/field_stats_flyout/use_field_stats_flytout_context';
diff --git a/x-pack/plugins/transform/public/app/hooks/use_index_data.ts b/x-pack/plugins/transform/public/app/hooks/use_index_data.ts
index 7b6911636c600..3a6781615b70b 100644
--- a/x-pack/plugins/transform/public/app/hooks/use_index_data.ts
+++ b/x-pack/plugins/transform/public/app/hooks/use_index_data.ts
@@ -51,7 +51,8 @@ export const useIndexData = (
   dataView: SearchItems['dataView'],
   query: TransformConfigQuery,
   combinedRuntimeMappings?: StepDefineExposedState['runtimeMappings'],
-  timeRangeMs?: TimeRangeMs
+  timeRangeMs?: TimeRangeMs,
+  populatedFields?: Set<string> | null
 ): UseIndexDataReturnType => {
   const { analytics } = useAppDependencies();
 
@@ -96,47 +97,53 @@ export const useIndexData = (
     // (for example, as part of filebeat/metricbeat/ECS based indices)
     // to the data grid component which would significantly slow down the page.
     const fetchDataGridSampleDocuments = async function () {
-      setErrorMessage('');
-      setStatus(INDEX_STATUS.LOADING);
-
-      const esSearchRequest = {
-        index: indexPattern,
-        body: {
-          fields: ['*'],
-          _source: false,
-          query: {
-            function_score: {
-              query: defaultQuery,
-              random_score: {},
+      let populatedDataViewFields = populatedFields ? [...populatedFields] : [];
+      let isMissingFields = populatedDataViewFields.length === 0;
+
+      // If populatedFields are not provided, make own request to calculate
+      if (populatedFields === undefined) {
+        setErrorMessage('');
+        setStatus(INDEX_STATUS.LOADING);
+
+        const esSearchRequest = {
+          index: indexPattern,
+          body: {
+            fields: ['*'],
+            _source: false,
+            query: {
+              function_score: {
+                query: defaultQuery,
+                random_score: {},
+              },
             },
+            size: 500,
           },
-          size: 500,
-        },
-      };
+        };
 
-      const resp = await dataSearch(esSearchRequest, abortController.signal);
+        const resp = await dataSearch(esSearchRequest, abortController.signal);
 
-      if (!isEsSearchResponse(resp)) {
-        setErrorMessage(getErrorMessage(resp));
-        setStatus(INDEX_STATUS.ERROR);
-        return;
-      }
+        if (!isEsSearchResponse(resp)) {
+          setErrorMessage(getErrorMessage(resp));
+          setStatus(INDEX_STATUS.ERROR);
+          return;
+        }
+        const docs = resp.hits.hits.map((d) => getProcessedFields(d.fields ?? {}));
+        isMissingFields = resp.hits.hits.every((d) => typeof d.fields === 'undefined');
 
+        populatedDataViewFields = [...new Set(docs.map(Object.keys).flat(1))];
+      }
       const isCrossClusterSearch = indexPattern.includes(':');
-      const isMissingFields = resp.hits.hits.every((d) => typeof d.fields === 'undefined');
-
-      const docs = resp.hits.hits.map((d) => getProcessedFields(d.fields ?? {}));
 
       // Get all field names for each returned doc and flatten it
       // to a list of unique field names used across all docs.
       const allDataViewFields = getFieldsFromKibanaIndexPattern(dataView);
-      const populatedFields = [...new Set(docs.map(Object.keys).flat(1))]
+      const filteredDataViewFields = populatedDataViewFields
         .filter((d) => allDataViewFields.includes(d))
         .sort();
 
       setCcsWarning(isCrossClusterSearch && isMissingFields);
       setStatus(INDEX_STATUS.LOADED);
-      setDataViewFields(populatedFields);
+      setDataViewFields(filteredDataViewFields);
     };
 
     fetchDataGridSampleDocuments();
@@ -145,7 +152,7 @@ export const useIndexData = (
       abortController.abort();
     };
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [timeRangeMs]);
+  }, [timeRangeMs, populatedFields?.size]);
 
   const columns: EuiDataGridColumn[] = useMemo(() => {
     if (typeof dataViewFields === 'undefined') {
diff --git a/x-pack/plugins/transform/public/app/hooks/use_search_items/use_search_items.ts b/x-pack/plugins/transform/public/app/hooks/use_search_items/use_search_items.ts
index c4ccff9944dd4..f2a59e0cb1a61 100644
--- a/x-pack/plugins/transform/public/app/hooks/use_search_items/use_search_items.ts
+++ b/x-pack/plugins/transform/public/app/hooks/use_search_items/use_search_items.ts
@@ -39,7 +39,10 @@ export const useSearchItems = (defaultSavedObjectId: string | undefined) => {
     }
 
     try {
-      fetchedSavedSearch = await appDeps.savedSearch.get(id);
+      // If data view already found, no need to get saved search
+      if (!fetchedDataView) {
+        fetchedSavedSearch = await appDeps.savedSearch.get(id);
+      }
     } catch (e) {
       // Just let fetchedSavedSearch stay undefined in case it doesn't exist.
     }
diff --git a/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_form.tsx b/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_form.tsx
index 9796d9f01de65..81bdb47735a37 100644
--- a/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_form.tsx
+++ b/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_form.tsx
@@ -58,7 +58,7 @@ import {
 import { useDocumentationLinks } from '../../../../hooks/use_documentation_links';
 import { useIndexData } from '../../../../hooks/use_index_data';
 import { useTransformConfigData } from '../../../../hooks/use_transform_config_data';
-import { useToastNotifications } from '../../../../app_dependencies';
+import { useAppDependencies, useToastNotifications } from '../../../../app_dependencies';
 import { SearchItems } from '../../../../hooks/use_search_items';
 import { getAggConfigFromEsAgg } from '../../../../common/pivot_aggs';
 
@@ -120,8 +120,20 @@ export const StepDefineForm: FC<StepDefineFormProps> = React.memo((props) => {
   const { transformConfigQuery } = stepDefineForm.searchBar.state;
   const { runtimeMappings } = stepDefineForm.runtimeMappingsEditor.state;
 
+  const appDependencies = useAppDependencies();
+  const {
+    ml: { useFieldStatsFlyoutContext },
+  } = appDependencies;
+
+  const fieldStatsContext = useFieldStatsFlyoutContext();
   const indexPreviewProps = {
-    ...useIndexData(dataView, transformConfigQuery, runtimeMappings, timeRangeMs),
+    ...useIndexData(
+      dataView,
+      transformConfigQuery,
+      runtimeMappings,
+      timeRangeMs,
+      fieldStatsContext?.populatedFields ?? null
+    ),
     dataTestSubj: 'transformIndexPreview',
     toastNotifications,
   };