diff --git a/whelk-core/src/main/groovy/whelk/JsonLd.groovy b/whelk-core/src/main/groovy/whelk/JsonLd.groovy
index 43149a8350..9b81a2c6f3 100644
--- a/whelk-core/src/main/groovy/whelk/JsonLd.groovy
+++ b/whelk-core/src/main/groovy/whelk/JsonLd.groovy
@@ -511,6 +511,10 @@ class JsonLd {
         return (o instanceof List) ? (List) o : o != null ? [o] : []
     }
 
+    static boolean looksLikeIri(String s) {
+        s && (s.startsWith('https://') || s.startsWith('http://'))
+    }
+
     static List<List<String>> findPaths(Map obj, String key, String value) {
         return findPaths(obj, key, [value].toSet())
     }
diff --git a/whelk-core/src/main/groovy/whelk/Whelk.groovy b/whelk-core/src/main/groovy/whelk/Whelk.groovy
index 9f5793b66f..0d59f543a2 100644
--- a/whelk-core/src/main/groovy/whelk/Whelk.groovy
+++ b/whelk-core/src/main/groovy/whelk/Whelk.groovy
@@ -164,23 +164,33 @@ class Whelk {
     }
 
     Map<String, Document> bulkLoad(Collection<String> ids) {
-        Map<String, Document> result = [:]
+        def idMap = [:]
+        def otherIris = []
+        List<String> systemIds = []
         ids.each { id ->
-            Document doc
-
-            // Fetch from DB
             if (id.startsWith(Document.BASE_URI.toString())) {
-                id = Document.BASE_URI.resolve(id).getPath().substring(1)
+                def systemId = Document.BASE_URI.resolve(id).getPath().substring(1)
+                idMap[systemId] = id
+                systemIds << systemId
             }
-            doc = storage.load(id)
-            if (doc == null)
-                doc = storage.getDocumentByIri(id)
-
-            if (doc && !doc.deleted) {
-                result[id] = doc
+            else if (JsonLd.looksLikeIri(id)) {
+                otherIris << id
+            }
+            else {
+                systemIds << id
             }
         }
-        return result
+        if (otherIris) {
+            Map<String, String> idToIri = storage.getSystemIdsByIris(otherIris)
+                    .collectEntries { k, v -> [(v): k] }
+            
+            systemIds.addAll(idToIri.keySet())
+            idMap.putAll(idToIri)
+        }
+        
+        return storage.bulkLoad(systemIds)
+                .findAll { id, doc -> !doc.deleted }
+                .collectEntries { id, doc -> [(idMap.getOrDefault(id, id)) : doc]}
     }
 
     private void reindex(Document updated, Document preUpdateDoc) {
diff --git a/whelk-core/src/main/groovy/whelk/component/PostgreSQLComponent.groovy b/whelk-core/src/main/groovy/whelk/component/PostgreSQLComponent.groovy
index 21ed3b1e16..9bb165c9ad 100644
--- a/whelk-core/src/main/groovy/whelk/component/PostgreSQLComponent.groovy
+++ b/whelk-core/src/main/groovy/whelk/component/PostgreSQLComponent.groovy
@@ -7,6 +7,7 @@ import com.zaxxer.hikari.metrics.prometheus.PrometheusHistogramMetricsTrackerFac
 import groovy.json.StringEscapeUtils
 import groovy.transform.CompileStatic
 import groovy.util.logging.Log4j2 as Log
+import org.apache.jena.atlas.iterator.Iter
 import org.postgresql.PGStatement
 import org.postgresql.util.PGobject
 import org.postgresql.util.PSQLException
@@ -118,6 +119,12 @@ class PostgreSQLComponent {
     private static final String GET_DOCUMENT_VERSION =
             "SELECT id, data FROM lddb__versions WHERE id = ? AND checksum = ?"
 
+    private static final String BULK_LOAD_DOCUMENTS = """
+            SELECT id, data, created, modified, deleted
+            FROM unnest(?) AS in_id, lddb l 
+            WHERE in_id = l.id
+            """.stripIndent()
+    
     private static final String GET_EMBELLISHED_DOCUMENT =
             "SELECT data from lddb__embellished where id = ?"
 
@@ -1827,6 +1834,27 @@ class PostgreSQLComponent {
         }
         return doc
     }
+    
+    Map<String, Document> bulkLoad(Iterable<String> systemIds) {
+        return withDbConnection {
+            Connection connection = getMyConnection()
+            PreparedStatement preparedStatement = null
+            ResultSet rs = null
+            try {
+                preparedStatement = connection.prepareStatement(BULK_LOAD_DOCUMENTS)
+                preparedStatement.setArray(1,  connection.createArrayOf("TEXT", systemIds as String[]))
+
+                rs = preparedStatement.executeQuery()
+                SortedMap<String, Document> result = new TreeMap<>()
+                while(rs.next()) {
+                    result[rs.getString("id")] = assembleDocument(rs)
+                }
+                return result
+            } finally {
+                close(rs, preparedStatement)
+            }
+        }
+    }
 
     String getSystemIdByIri(String iri) {
         return withDbConnection {