diff --git a/Mastodon/Scene/Profile/Following/FollowingListViewModel+Diffable.swift b/Mastodon/Scene/Profile/Following/FollowingListViewModel+Diffable.swift
index 29fe6fab3..0aba23ccf 100644
--- a/Mastodon/Scene/Profile/Following/FollowingListViewModel+Diffable.swift
+++ b/Mastodon/Scene/Profile/Following/FollowingListViewModel+Diffable.swift
@@ -22,8 +22,8 @@ extension FollowingListViewModel {
             configuration: UserSection.Configuration(
                 userTableViewCellDelegate: userTableViewCellDelegate
             ),
-            followedUsers: followedUserIds.eraseToAnyPublisher(),
-            blockedUsers: blockedUserIds.eraseToAnyPublisher()
+            followedUsers: authContext.mastodonAuthenticationBox.inMemoryCache.$followingUserIds.eraseToAnyPublisher(),
+            blockedUsers: authContext.mastodonAuthenticationBox.inMemoryCache.$blockedUserIds.eraseToAnyPublisher()
         )
         
         // workaround to append loader wrong animation issue
diff --git a/MastodonIntent/Handler/SendPostIntentHandler.swift b/MastodonIntent/Handler/SendPostIntentHandler.swift
index 7f7bdce9b..54fcefe39 100644
--- a/MastodonIntent/Handler/SendPostIntentHandler.swift
+++ b/MastodonIntent/Handler/SendPostIntentHandler.swift
@@ -69,7 +69,8 @@ extension SendPostIntentHandler: SendPostIntentHandling {
                     domain: authentication.domain,
                     userID: authentication.userID,
                     appAuthorization: .init(accessToken: authentication.appAccessToken),
-                    userAuthorization: .init(accessToken: authentication.userAccessToken)
+                    userAuthorization: .init(accessToken: authentication.userAccessToken),
+                    inMemoryCache: .sharedCache(for: authentication.objectID.description)
                 )
             }
             
diff --git a/MastodonSDK/Sources/MastodonCore/Authentication/MastodonAuthenticationBox.swift b/MastodonSDK/Sources/MastodonCore/Authentication/MastodonAuthenticationBox.swift
index ec6cb0bfb..85dc666f2 100644
--- a/MastodonSDK/Sources/MastodonCore/Authentication/MastodonAuthenticationBox.swift
+++ b/MastodonSDK/Sources/MastodonCore/Authentication/MastodonAuthenticationBox.swift
@@ -15,19 +15,22 @@ public struct MastodonAuthenticationBox: UserIdentifier {
     public let userID: MastodonUser.ID
     public let appAuthorization: Mastodon.API.OAuth.Authorization
     public let userAuthorization: Mastodon.API.OAuth.Authorization
-    
+    public let inMemoryCache: MastodonAccountInMemoryCache
+
     public init(
         authenticationRecord: ManagedObjectRecord<MastodonAuthentication>,
         domain: String,
         userID: MastodonUser.ID,
         appAuthorization: Mastodon.API.OAuth.Authorization,
-        userAuthorization: Mastodon.API.OAuth.Authorization
+        userAuthorization: Mastodon.API.OAuth.Authorization,
+        inMemoryCache: MastodonAccountInMemoryCache
     ) {
         self.authenticationRecord = authenticationRecord
         self.domain = domain
         self.userID = userID
         self.appAuthorization = appAuthorization
         self.userAuthorization = userAuthorization
+        self.inMemoryCache = inMemoryCache
     }
 }
 
@@ -39,8 +42,26 @@ extension MastodonAuthenticationBox {
             domain: authentication.domain,
             userID: authentication.userID,
             appAuthorization: Mastodon.API.OAuth.Authorization(accessToken: authentication.appAccessToken),
-            userAuthorization: Mastodon.API.OAuth.Authorization(accessToken: authentication.userAccessToken)
+            userAuthorization: Mastodon.API.OAuth.Authorization(accessToken: authentication.userAccessToken),
+            inMemoryCache: .sharedCache(for: authentication.objectID.description)
         )
     }
     
 }
+
+public class MastodonAccountInMemoryCache {
+    @Published public var followingUserIds: [String] = []
+    @Published public var blockedUserIds: [String] = []
+    
+    static var sharedCaches = [String: MastodonAccountInMemoryCache]()
+    
+    public static func sharedCache(for key: String) -> MastodonAccountInMemoryCache {
+        if let sharedCache = sharedCaches[key] {
+            return sharedCache
+        }
+        
+        let sharedCache = MastodonAccountInMemoryCache()
+        sharedCaches[key] = sharedCache
+        return sharedCache
+    }
+}
diff --git a/MastodonSDK/Sources/MastodonCore/Service/AuthenticationService.swift b/MastodonSDK/Sources/MastodonCore/Service/AuthenticationService.swift
index 00b0e46cd..a865286cb 100644
--- a/MastodonSDK/Sources/MastodonCore/Service/AuthenticationService.swift
+++ b/MastodonSDK/Sources/MastodonCore/Service/AuthenticationService.swift
@@ -12,6 +12,8 @@ import CoreData
 import CoreDataStack
 import MastodonSDK
 
+private typealias IterativeResponse = (ids: [String], maxID: String?)
+
 public final class AuthenticationService: NSObject {
 
     var disposeBag = Set<AnyCancellable>()
@@ -25,6 +27,46 @@ public final class AuthenticationService: NSObject {
     // output
     @Published public var mastodonAuthentications: [ManagedObjectRecord<MastodonAuthentication>] = []
     @Published public var mastodonAuthenticationBoxes: [MastodonAuthenticationBox] = []
+    
+    private func fetchFollowedBlockedUserIds(
+        _ authBox: MastodonAuthenticationBox,
+        _ previousFollowingIDs: [String]? = nil,
+        _ maxID: String? = nil
+    ) async throws {
+        guard let apiService = apiService else { return }
+        
+        let followingResponse = try await fetchFollowing(maxID, apiService, authBox)
+        let followingIds = (previousFollowingIDs ?? []) + followingResponse.ids
+
+        if let nextMaxID = followingResponse.maxID {
+            return try await fetchFollowedBlockedUserIds(authBox, followingIds, nextMaxID)
+        }
+        
+        let blockedIds = try await apiService.getBlocked(
+            authenticationBox: authBox
+        ).value.map { $0.id }
+        
+        authBox.inMemoryCache.followingUserIds = followingIds
+        authBox.inMemoryCache.blockedUserIds = blockedIds
+    }
+
+    private func fetchFollowing(
+        _ maxID: String?,
+        _ apiService: APIService,
+        _ mastodonAuthenticationBox: MastodonAuthenticationBox
+    ) async throws -> IterativeResponse {
+        let response = try await apiService.following(
+            userID: mastodonAuthenticationBox.userID,
+            maxID: maxID,
+            authenticationBox: mastodonAuthenticationBox
+        )
+        
+        let ids: [String] = response.value.map { $0.id }
+        let maxID: String? = response.link?.maxID
+        
+        return (ids, maxID)
+    }
+    
     public let updateActiveUserAccountPublisher = PassthroughSubject<Void, Never>()
 
     init(
@@ -50,6 +92,18 @@ public final class AuthenticationService: NSObject {
         super.init()
 
         mastodonAuthenticationFetchedResultsController.delegate = self
+        
+        $mastodonAuthenticationBoxes
+            .sink { [weak self] boxes in
+                Task { [weak self] in
+                    for authBox in boxes {
+                        do { try await self?.fetchFollowedBlockedUserIds(authBox) }
+                        catch {}
+                    }
+                }
+            }
+            .store(in: &disposeBag)
+        
 
         // TODO: verify credentials for active authentication
         
diff --git a/MastodonSDK/Sources/MastodonCore/Service/Notification/NotificationService.swift b/MastodonSDK/Sources/MastodonCore/Service/Notification/NotificationService.swift
index 65d92fc29..adabd8962 100644
--- a/MastodonSDK/Sources/MastodonCore/Service/Notification/NotificationService.swift
+++ b/MastodonSDK/Sources/MastodonCore/Service/Notification/NotificationService.swift
@@ -267,7 +267,8 @@ extension NotificationService {
                 domain: authentication.domain,
                 userID: authentication.userID,
                 appAuthorization: .init(accessToken: authentication.appAccessToken),
-                userAuthorization: .init(accessToken: authentication.userAccessToken)
+                userAuthorization: .init(accessToken: authentication.userAccessToken),
+                inMemoryCache: .sharedCache(for: authentication.objectID.description)
             )
         }
     }