diff --git a/desktopApp/compose-desktop.pro b/desktopApp/compose-desktop.pro
index 6818d8e6..4c3a9224 100644
--- a/desktopApp/compose-desktop.pro
+++ b/desktopApp/compose-desktop.pro
@@ -126,4 +126,50 @@
 -dontwarn com.google.appengine.**
 -dontwarn com.dropbox**.android.**
 -dontwarn org.testng.**
--dontwarn bsh.**
\ No newline at end of file
+-dontwarn bsh.**
+
+# Kotlinx Serialization
+# Keep `Companion` object fields of serializable classes.
+# This avoids serializer lookup through `getDeclaredClasses` as done for named companion objects.
+-if @kotlinx.serialization.Serializable class **
+-keepclassmembers class <1> {
+    static <1>$Companion Companion;
+}
+
+# Keep `serializer()` on companion objects (both default and named) of serializable classes.
+-if @kotlinx.serialization.Serializable class ** {
+    static **$* *;
+}
+-keepclassmembers class <2>$<3> {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Keep `INSTANCE.serializer()` of serializable objects.
+-if @kotlinx.serialization.Serializable class ** {
+    public static ** INSTANCE;
+}
+-keepclassmembers class <1> {
+    public static <1> INSTANCE;
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# @Serializable and @Polymorphic are used at runtime for polymorphic serialization.
+-keepattributes RuntimeVisibleAnnotations,AnnotationDefault
+
+# Don't print notes about potential mistakes or omissions in the configuration for kotlinx-serialization classes
+# See also https://github.com/Kotlin/kotlinx.serialization/issues/1900
+-dontnote kotlinx.serialization.**
+
+# Serialization core uses `java.lang.ClassValue` for caching inside these specified classes.
+# If there is no `java.lang.ClassValue` (for example, in Android), then R8/ProGuard will print a warning.
+# However, since in this case they will not be used, we can disable these warnings
+-dontwarn kotlinx.serialization.internal.ClassValueReferences
+
+# disable optimisation for descriptor field because in some versions of ProGuard, optimization generates incorrect bytecode that causes a verification error
+# see https://github.com/Kotlin/kotlinx.serialization/issues/2719
+-keepclassmembers public class **$$serializer {
+    private ** descriptor;
+}
+
+
+-keep class com.prof18.feedflow.feedsync.greader.data.dto.** { *; }
\ No newline at end of file
diff --git a/feedSync/greader/src/commonMain/kotlin/com/prof18/feedflow/feedsync/greader/GReaderRepository.kt b/feedSync/greader/src/commonMain/kotlin/com/prof18/feedflow/feedsync/greader/GReaderRepository.kt
index fc14eb44..a05caf88 100644
--- a/feedSync/greader/src/commonMain/kotlin/com/prof18/feedflow/feedsync/greader/GReaderRepository.kt
+++ b/feedSync/greader/src/commonMain/kotlin/com/prof18/feedflow/feedsync/greader/GReaderRepository.kt
@@ -7,6 +7,7 @@ import com.prof18.feedflow.core.domain.DateFormatter
 import com.prof18.feedflow.core.model.DataNotFound
 import com.prof18.feedflow.core.model.DataResult
 import com.prof18.feedflow.core.model.FeedFilter
+import com.prof18.feedflow.core.model.FeedItem
 import com.prof18.feedflow.core.model.FeedItemId
 import com.prof18.feedflow.core.model.FeedSource
 import com.prof18.feedflow.core.model.FeedSourceCategory
@@ -32,10 +33,8 @@ import com.prof18.feedflow.feedsync.greader.domain.SubscriptionEditAction
 import com.prof18.feedflow.feedsync.greader.domain.mapping.ItemContentDTOMapper
 import com.prof18.feedflow.feedsync.greader.domain.mapping.toFeedSource
 import com.prof18.feedflow.feedsync.networkcore.NetworkSettings
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.flow.asFlow
-import kotlinx.coroutines.flow.collect
-import kotlinx.coroutines.flow.flatMapMerge
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlinx.datetime.Clock
 import kotlin.time.Duration.Companion.days
@@ -361,7 +360,6 @@ class GReaderRepository internal constructor(
         return Unit.success()
     }
 
-    @OptIn(ExperimentalCoroutinesApi::class)
     private suspend fun getItemsContent() {
         val idsFromDb = databaseHelper.getAllFeedItemUrlHashes().toSet()
         val items: Set<String> = with(syncItemHolder.get()) {
@@ -374,12 +372,11 @@ class GReaderRepository internal constructor(
         }
 
         val feedSources = databaseHelper.getFeedSources().toSet()
+        val feedItemsHolder = AtomicReference(emptyList<FeedItem>())
 
-        items
-            .chunked(PAGE_SIZE)
-            .asFlow()
-            .flatMapMerge { itemIds ->
-                suspend {
+        coroutineScope {
+            items.chunked(PAGE_SIZE).map { itemIds ->
+                launch {
                     gReaderClient.getStreamItemsContents(itemIds)
                         .fold(
                             onSuccess = { itemsResponse ->
@@ -392,15 +389,18 @@ class GReaderRepository internal constructor(
                                         feedSource = feedSource,
                                     )
                                 }
-                                databaseHelper.insertFeedItems(feedItems, dateFormatter.currentTimeMillis())
+                                feedItemsHolder.set(feedItemsHolder.get() + feedItems)
+                                logger.d { ">>> Finished chunk: size ${feedItems.size}" }
                             },
                             onFailure = {
                                 feedSyncMessageQueue.emitResult(SyncResult.Error)
                             },
                         )
-                }.asFlow()
+                }
             }
-            .collect()
+        }
+        logger.d { "Inserting into db: size ${feedItemsHolder.get().size}" }
+        databaseHelper.insertFeedItems(feedItemsHolder.get(), dateFormatter.currentTimeMillis())
     }
 
     private fun getAuthToken(responseBody: String): String? =