Reduce device link fetching timeout

SignalServiceKit/src/Messages/OWSMessageManager.m

@@ -1250,8 +1250,9 @@ NS_ASSUME_NONNULL_BEGIN
     }
 
     // Loki: Update device links in a blocking way
-    // TODO: This is pretty bad for performance...
+    // FIXME: This is horrible for performance
-    // The envelope source is set during UD decryption.
+    // FIXME: ========
+    // The envelope source is set during UD decryption
     if ([ECKeyPair isValidHexEncodedPublicKeyWithCandidate:envelope.source] && dataMessage.publicChatInfo == nil) { // Handled in LokiPublicChatPoller for open group messages
         dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
         [[LKMultiDeviceProtocol updateDeviceLinksIfNeededForHexEncodedPublicKey:envelope.source in:transaction].ensureOn(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^() {
@@ -1259,8 +1260,9 @@ NS_ASSUME_NONNULL_BEGIN
         }).catchOn(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(NSError *error) {
             dispatch_semaphore_signal(semaphore);
         }) retainUntilComplete];
-        dispatch_semaphore_wait(semaphore, dispatch_time(DISPATCH_TIME_NOW, 10 * NSEC_PER_SEC));
+        dispatch_semaphore_wait(semaphore, dispatch_time(DISPATCH_TIME_NOW, 4 * NSEC_PER_SEC));
     }
+    // FIXME: ========
 
     if (groupId.length > 0) {
         NSMutableSet *newMemberIds = [NSMutableSet setWithArray:dataMessage.group.members];