过多的线程无用，8线程已足够；网络并发交由协程调度，不影响并发量。

app/src/main/java/io/legado/app/model/webBook/SearchBookModel.kt

@@ -27,7 +27,7 @@ class SearchBookModel(private val scope: CoroutineScope, private val callBack: C
     private var searchIndex = -1
 
     private fun initSearchPool() {
-        searchPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+        searchPool = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
     }
 
     fun search(searchId: Long, key: String) {

app/src/main/java/io/legado/app/service/CacheBookService.kt

@@ -27,11 +27,12 @@ import splitties.init.appCtx
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.CopyOnWriteArraySet
 import java.util.concurrent.Executors
+import kotlin.math.min
 
 class CacheBookService : BaseService() {
     private val threadCount = AppConfig.threadCount
     private var searchPool =
-        Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+        Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
     private var tasks = CompositeCoroutine()
     private val handler = Handler(Looper.getMainLooper())
     private var runnable: Runnable = Runnable { upDownload() }

app/src/main/java/io/legado/app/service/CheckSourceService.kt

@@ -24,7 +24,7 @@ import kotlin.math.min
 
 class CheckSourceService : BaseService() {
     private var threadCount = AppConfig.threadCount
-    private var searchCoroutine = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+    private var searchCoroutine = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
     private var tasks = CompositeCoroutine()
     private val allIds = ArrayList<String>()
     private val checkedIds = ArrayList<String>()

app/src/main/java/io/legado/app/ui/book/changecover/ChangeCoverViewModel.kt

@@ -50,7 +50,7 @@ class ChangeCoverViewModel(application: Application) : BaseViewModel(application
     }
 
     private fun initSearchPool() {
-        searchPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+        searchPool = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
         searchIndex = -1
     }
 

app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt

@@ -24,6 +24,7 @@ import kotlinx.coroutines.asCoroutineDispatcher
 import splitties.init.appCtx
 import java.util.concurrent.CopyOnWriteArraySet
 import java.util.concurrent.Executors
+import kotlin.math.min
 
 class ChangeSourceViewModel(application: Application) : BaseViewModel(application) {
     private val threadCount = AppConfig.threadCount
@@ -56,7 +57,7 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
     }
 
     private fun initSearchPool() {
-        searchPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+        searchPool = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
         searchIndex = -1
     }
 

app/src/main/java/io/legado/app/ui/main/MainViewModel.kt

@@ -23,7 +23,7 @@ import kotlin.math.min
 
 class MainViewModel(application: Application) : BaseViewModel(application) {
     private var threadCount = AppConfig.threadCount
-    private var upTocPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+    private var upTocPool = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
     val updateList = CopyOnWriteArraySet<String>()
     private val bookMap = ConcurrentHashMap<String, Book>()
 
@@ -38,7 +38,7 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
     fun upPool() {
         threadCount = AppConfig.threadCount
         upTocPool.close()
-        upTocPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
+        upTocPool = Executors.newFixedThreadPool(min(threadCount,8)).asCoroutineDispatcher()
     }
 
     fun upAllBookToc() {