diff --git a/Sources/ZcashLightClientKit/Block/DatabaseStorage/CompactBlockStorage.swift b/Sources/ZcashLightClientKit/Block/DatabaseStorage/CompactBlockStorage.swift
index 5a9ccd9b..9a2166a9 100644
--- a/Sources/ZcashLightClientKit/Block/DatabaseStorage/CompactBlockStorage.swift
+++ b/Sources/ZcashLightClientKit/Block/DatabaseStorage/CompactBlockStorage.swift
@@ -86,7 +86,7 @@ extension CompactBlockStorage: CompactBlockRepository {
     }
     
     func latestHeight(result: @escaping (Swift.Result<BlockHeight, Error>) -> Void) {
-        DispatchQueue.global(qos: .default).async {
+        DispatchQueue.global(qos: .userInitiated).async {
             do {
                 result(.success(try self.latestBlockHeight()))
             } catch {
@@ -100,7 +100,7 @@ extension CompactBlockStorage: CompactBlockRepository {
     }
     
     func write(blocks: [ZcashCompactBlock], completion: ((Error?) -> Void)?) {
-        DispatchQueue.global(qos: .default).async {
+        DispatchQueue.global(qos: .userInitiated).async {
             do {
                 try self.insert(blocks)
                 completion?(nil)
@@ -111,7 +111,7 @@ extension CompactBlockStorage: CompactBlockRepository {
     }
     
     func rewind(to height: BlockHeight, completion: ((Error?) -> Void)?) {
-        DispatchQueue.global(qos: .default).async {
+        DispatchQueue.global(qos: .userInitiated).async {
             do {
                 try self.rewind(to: height)
                 completion?(nil)
diff --git a/Sources/ZcashLightClientKit/Block/Processor/CompactBlockProcessor.swift b/Sources/ZcashLightClientKit/Block/Processor/CompactBlockProcessor.swift
index 04392989..acea0ba8 100644
--- a/Sources/ZcashLightClientKit/Block/Processor/CompactBlockProcessor.swift
+++ b/Sources/ZcashLightClientKit/Block/Processor/CompactBlockProcessor.swift
@@ -1397,7 +1397,7 @@ extension CompactBlockProcessor {
             queue: DispatchQueue?,
             result: @escaping (Result<FigureNextBatchOperation.NextState, Error>) -> Void
         ) {
-            let dispatchQueue = queue ?? DispatchQueue.global(qos: .default)
+            let dispatchQueue = queue ?? DispatchQueue.global(qos: .userInitiated)
             
             dispatchQueue.async {
                 do {
diff --git a/Sources/ZcashLightClientKit/DAO/PagedTransactionDao.swift b/Sources/ZcashLightClientKit/DAO/PagedTransactionDao.swift
index e6655605..a7215722 100644
--- a/Sources/ZcashLightClientKit/DAO/PagedTransactionDao.swift
+++ b/Sources/ZcashLightClientKit/DAO/PagedTransactionDao.swift
@@ -50,7 +50,7 @@ class PagedTransactionDAO: PaginatedTransactionRepository {
     }
     
     func page(_ number: Int, result: @escaping (Result<[TransactionEntity]?, Error>) -> Void) {
-        DispatchQueue.global(qos: .default).async { [weak self] in
+        DispatchQueue.global(qos: .userInitiated).async { [weak self] in
             guard let self = self else { return }
             do {
                 result(.success(try self.page(number)))
diff --git a/Sources/ZcashLightClientKit/Transaction/PersistentTransactionManager.swift b/Sources/ZcashLightClientKit/Transaction/PersistentTransactionManager.swift
index c5d81d6d..c93db928 100644
--- a/Sources/ZcashLightClientKit/Transaction/PersistentTransactionManager.swift
+++ b/Sources/ZcashLightClientKit/Transaction/PersistentTransactionManager.swift
@@ -35,7 +35,7 @@ class PersistentTransactionManager: OutboundTransactionManager {
         self.encoder = encoder
         self.service = service
         self.network = networkType
-        self.queue = DispatchQueue.init(label: "PersistentTransactionManager.serial.queue", qos: .default)
+        self.queue = DispatchQueue.init(label: "PersistentTransactionManager.serial.queue", qos: .userInitiated)
     }
     
     func initSpend(