diff --git a/TYTextKitDemo.xcodeproj/project.pbxproj b/TYTextKitDemo.xcodeproj/project.pbxproj
index ac7ce40..3948a72 100644
--- a/TYTextKitDemo.xcodeproj/project.pbxproj
+++ b/TYTextKitDemo.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		0D4F220C24DC5350001EBC31 /* TYTaskScheduler.m in Sources */ = {isa = PBXBuildFile; fileRef = 0D4F220B24DC5350001EBC31 /* TYTaskScheduler.m */; };
 		2B0869F11FAFFB85008062CF /* TextAutolayoutController.m in Sources */ = {isa = PBXBuildFile; fileRef = 2B0869EF1FAFFB85008062CF /* TextAutolayoutController.m */; };
 		2B0869F21FAFFB85008062CF /* TextAutolayoutController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2B0869F01FAFFB85008062CF /* TextAutolayoutController.xib */; };
 		2B426F461F78F062009E70D9 /* TextDemoViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 2B426F451F78F062009E70D9 /* TextDemoViewController.m */; };
@@ -38,6 +39,8 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		0D4F220A24DC5350001EBC31 /* TYTaskScheduler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TYTaskScheduler.h; sourceTree = "<group>"; };
+		0D4F220B24DC5350001EBC31 /* TYTaskScheduler.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = TYTaskScheduler.m; sourceTree = "<group>"; };
 		2B0869EE1FAFFB85008062CF /* TextAutolayoutController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = TextAutolayoutController.h; sourceTree = "<group>"; };
 		2B0869EF1FAFFB85008062CF /* TextAutolayoutController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TextAutolayoutController.m; sourceTree = "<group>"; };
 		2B0869F01FAFFB85008062CF /* TextAutolayoutController.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = TextAutolayoutController.xib; sourceTree = "<group>"; };
@@ -127,6 +130,8 @@
 				2B4850FB1FBD7B230021BB28 /* TYTextView.m */,
 				2B4851191FBD7B510021BB28 /* TYAsyncLayer.h */,
 				2B4851181FBD7B510021BB28 /* TYAsyncLayer.m */,
+				0D4F220A24DC5350001EBC31 /* TYTaskScheduler.h */,
+				0D4F220B24DC5350001EBC31 /* TYTaskScheduler.m */,
 				2B4850FF1FBD7B230021BB28 /* TextKit */,
 			);
 			path = TYText;
@@ -304,6 +309,7 @@
 				2B49A1221F973B19007E1935 /* ImageTextListViewController.m in Sources */,
 				2B48510F1FBD7B230021BB28 /* TYTextView.m in Sources */,
 				2B426F4F1F78F7AE009E70D9 /* TextViewCell.m in Sources */,
+				0D4F220C24DC5350001EBC31 /* TYTaskScheduler.m in Sources */,
 				2B4851141FBD7B230021BB28 /* TYTextParse.m in Sources */,
 				2B4851131FBD7B230021BB28 /* TYTextRender.m in Sources */,
 				2B426F551F790A3C009E70D9 /* TYFPSLabel.m in Sources */,
diff --git a/TYTextKitDemo/.DS_Store b/TYTextKitDemo/.DS_Store
new file mode 100644
index 0000000..f8f00b4
Binary files /dev/null and b/TYTextKitDemo/.DS_Store differ
diff --git a/TYTextKitDemo/TYText/TYAsyncLayer.h b/TYTextKitDemo/TYText/TYAsyncLayer.h
index e36e6f9..b2ca22d 100644
--- a/TYTextKitDemo/TYText/TYAsyncLayer.h
+++ b/TYTextKitDemo/TYText/TYAsyncLayer.h
@@ -48,6 +48,7 @@ CGFloat ty_text_screen_scale(void);
 
 @interface TYAsyncLayerDisplayTask : NSObject
 
+@property (nullable, nonatomic, weak) CALayer *layer;
 
 /**
  will display layer on main thread.
diff --git a/TYTextKitDemo/TYText/TYAsyncLayer.m b/TYTextKitDemo/TYText/TYAsyncLayer.m
index 401849e..45242e1 100644
--- a/TYTextKitDemo/TYText/TYAsyncLayer.m
+++ b/TYTextKitDemo/TYText/TYAsyncLayer.m
@@ -9,6 +9,8 @@
 #import "TYAsyncLayer.h"
 #import <stdatomic.h>
 
+#import "TYTaskScheduler.h"
+
 static dispatch_queue_t asyncDisplayQueue() {
     static dispatch_queue_t displayQueue = NULL;
     static dispatch_once_t onceToken;
@@ -122,10 +124,18 @@ - (void)dealloc {
 }
 
 #pragma mark - private
-
 - (void)displayAsync:(BOOL)asynchronously {
     __strong id<TYAsyncLayerDelegate> delegate = _asyncDelegate;
-    TYAsyncLayerDisplayTask *task = [delegate newAsyncDisplayTask];
+    TYAsyncLayerDisplayTask *ltask = [delegate newAsyncDisplayTask];
+    ltask.layer = self;
+    __weak TYAsyncLayer *weakSelf = self;
+    void (^block)(TYAsyncLayerDisplayTask *task) = ^(TYAsyncLayerDisplayTask *task) {
+        [weakSelf displayAsync:asynchronously task:task];
+    };
+    [[TYTaskScheduler sharedInstance] dispatchTask:ltask block:block];
+}
+
+- (void)displayAsync:(BOOL)asynchronously task:(TYAsyncLayerDisplayTask *)task {
     if (task.willDisplay) {
         task.willDisplay(self);
     }
diff --git a/TYTextKitDemo/TYText/TYTaskScheduler.h b/TYTextKitDemo/TYText/TYTaskScheduler.h
new file mode 100644
index 0000000..aa3fe60
--- /dev/null
+++ b/TYTextKitDemo/TYText/TYTaskScheduler.h
@@ -0,0 +1,22 @@
+//
+//  TYTaskScheduler.h
+//  TYTextKitDemo
+//
+//  Created by jufan wang on 2020/8/6.
+//  Copyright © 2020 tany. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@class TYAsyncLayerDisplayTask;
+
+@interface TYTaskScheduler : NSObject
+
++ (instancetype)sharedInstance;
+
+@property (nonatomic, assign) NSInteger maxScheduleCount;
+
+- (void)dispatchTask:(TYAsyncLayerDisplayTask *)task
+               block:(void (^)(TYAsyncLayerDisplayTask *task))block;
+
+@end
diff --git a/TYTextKitDemo/TYText/TYTaskScheduler.m b/TYTextKitDemo/TYText/TYTaskScheduler.m
new file mode 100644
index 0000000..9f86a71
--- /dev/null
+++ b/TYTextKitDemo/TYText/TYTaskScheduler.m
@@ -0,0 +1,100 @@
+//
+//  TYTaskScheduler.m
+//  TYTextKitDemo
+//
+//  Created by jufan wang on 2020/8/6.
+//  Copyright © 2020 tany. All rights reserved.
+//
+
+#import "TYTaskScheduler.h"
+#import "TYAsyncLayer.h"
+
+@interface TYTaskScheduleParas : NSObject
+@property (nonatomic, strong) TYAsyncLayerDisplayTask *task;
+@property (nullable, nonatomic, copy) void (^block)(TYAsyncLayerDisplayTask *task);
+@end
+@implementation TYTaskScheduleParas
+@end
+
+@interface TYTaskScheduler() {
+    CFRunLoopObserverRef _pendingListObserver;
+}
+@property (nonatomic, strong) NSMutableArray<TYTaskScheduleParas *>* tasksArray;
+@end
+
+@implementation TYTaskScheduler
+
++ (instancetype)sharedInstance {
+    static dispatch_once_t onceToken;
+    static TYTaskScheduler *_taskScheduler = nil;
+    dispatch_once(&onceToken, ^{
+        _taskScheduler = [[TYTaskScheduler alloc] init];
+    });
+    return _taskScheduler;
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        _tasksArray = [NSMutableArray array];
+        _maxScheduleCount = 22;
+        [self schedulePendingList];
+    }
+    return self;
+}
+
+- (void)dispatchTask:(TYAsyncLayerDisplayTask *)task
+               block:(void (^)(TYAsyncLayerDisplayTask *task))block {
+    TYTaskScheduleParas *paras = nil;
+    for (TYTaskScheduleParas *pa in self.tasksArray) {
+        if (pa.task.layer == task.layer) {
+            paras = pa;
+            [self.tasksArray removeObject:paras];
+            break;
+        }
+    }
+    if (!paras) {
+        paras = [[TYTaskScheduleParas alloc] init];
+    }
+    paras.block = block;
+    paras.task = task;
+    [self.tasksArray addObject:paras];
+    if (self.tasksArray.count > self.maxScheduleCount) {
+        [self.tasksArray removeObjectsInRange:NSMakeRange(0, self.tasksArray.count - self.maxScheduleCount)];
+    }
+}
+
+#pragma mark -- schedule
+
+- (void)clearPendingList {
+    if (_pendingListObserver) {
+        CFRunLoopRemoveObserver(CFRunLoopGetMain(), _pendingListObserver, kCFRunLoopCommonModes);
+        CFRelease(_pendingListObserver);
+        _pendingListObserver = NULL;
+    }
+}
+
+- (void)schedulePendingList {
+    // see WebKit for magic numbers, eg http://trac.webkit.org/changeset/166540
+    static const CFIndex TYTransactionCommitRunLoopOrder = 2000000;
+    static const CFIndex TYTaskSchedulerApplyRunLoopOrder = TYTransactionCommitRunLoopOrder - 1;    
+    __weak TYTaskScheduler *weakSelf = self;
+    if (!_pendingListObserver) {
+        _pendingListObserver = CFRunLoopObserverCreateWithHandler(kCFAllocatorDefault, kCFRunLoopBeforeWaiting | kCFRunLoopExit, YES, TYTaskSchedulerApplyRunLoopOrder, ^(CFRunLoopObserverRef observer, CFRunLoopActivity activity) {
+            TYTaskScheduleParas *paras = [weakSelf.tasksArray lastObject];
+            if (!paras) return ;
+            [weakSelf.tasksArray removeObject:paras];
+            if (paras.block) {
+                paras.block(paras.task);
+            }
+        });
+        CFRunLoopAddObserver(CFRunLoopGetMain(), _pendingListObserver,  kCFRunLoopCommonModes);
+    }
+}
+
+- (void)dealloc {
+    [self clearPendingList];
+}
+
+@end
+
+
diff --git a/TYTextKitDemo/TextListViewController.m b/TYTextKitDemo/TextListViewController.m
index 8bebc25..35e02f4 100644
--- a/TYTextKitDemo/TextListViewController.m
+++ b/TYTextKitDemo/TextListViewController.m
@@ -50,7 +50,7 @@ - (void)loadData {
     NSMutableArray *itemArray = [NSMutableArray array];
     NSMutableArray *textArray = [NSMutableArray array];
     NSMutableArray *renderArray = [NSMutableArray array];
-    for (int i = 0; i < 200; ++i) {
+    for (int i = 0; i < 2000; ++i) {
         NSString *str = [NSString stringWithFormat:@"%d Async Display Test ✺◟(❛ัᴗ❛∗)◞✺ ✺◟(∗❛ᴗ❛∗)◞✺ 😀😖😐😣😡🚖🚌🚋🎊💖💗💛💙🏨🏦🏫 Async Display Test ✺◟(∗❛ᴗ❛∗)◞✺ ✺◟(∗❛ᴗ❛∗)◞✺ 😀😖😐😣😡🚖🚌🚋🎊💖💗💛💙🏨🏦🏫",i%3 ? i:i*100];
         
         NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:str];