diff --git a/SVGAPlayer.podspec b/SVGAPlayer.podspec
index f10295d..c5cd46f 100644
--- a/SVGAPlayer.podspec
+++ b/SVGAPlayer.podspec
@@ -1,7 +1,7 @@
 
 Pod::Spec.new do |s|
   s.name         = "SVGAPlayer"
-  s.version      = "2.5.4"
+  s.version      = "2.5.5"
   s.summary      = "SVGAPlayer 是一个高性能的动画播放器"
   s.description  = <<-DESC
                    SVGA 是一种全新的动画格式，由 YY UED 团队主导开发；
diff --git a/SVGAPlayer/ViewController.m b/SVGAPlayer/ViewController.m
index f3a50ff..ab84ce7 100644
--- a/SVGAPlayer/ViewController.m
+++ b/SVGAPlayer/ViewController.m
@@ -50,6 +50,7 @@ static SVGAParser *parser;
                        @"https://github.com/yyued/SVGA-Samples/blob/master/rose.svga?raw=true",
                        ];
     [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
+//    parser.enabledMemoryCache = YES;
     [parser parseWithURL:[NSURL URLWithString:items[arc4random() % items.count]]
          completionBlock:^(SVGAVideoEntity * _Nullable videoItem) {
              [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
@@ -66,6 +67,8 @@ static SVGAParser *parser;
                                                 NSParagraphStyleAttributeName: para,
                                             }];
                  [self.aPlayer setAttributedText:str forKey:@"banner"];
+                 
+//                 self.aPlayer.mianRunLoopMode = NSDefaultRunLoopMode;
                  [self.aPlayer startAnimation];
              }
          } failureBlock:nil];
diff --git a/Source/SVGAPlayer.h b/Source/SVGAPlayer.h
index 9d22557..4f9b428 100644
--- a/Source/SVGAPlayer.h
+++ b/Source/SVGAPlayer.h
@@ -28,6 +28,7 @@ typedef void(^SVGAPlayerDynamicDrawingBlock)(CALayer *contentLayer, NSInteger fr
 @property (nonatomic, assign) IBInspectable int loops;
 @property (nonatomic, assign) IBInspectable BOOL clearsAfterStop;
 @property (nonatomic, copy) NSString *fillMode;
+@property (nonatomic, copy) NSRunLoopMode mainRunLoopMode;
 
 - (void)startAnimation;
 - (void)startAnimationWithRange:(NSRange)range reverse:(BOOL)reverse;
diff --git a/Source/SVGAPlayer.m b/Source/SVGAPlayer.m
index 61aa19e..18ccc2d 100644
--- a/Source/SVGAPlayer.m
+++ b/Source/SVGAPlayer.m
@@ -84,7 +84,7 @@
     }
     self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(next)];
     self.displayLink.frameInterval = 60 / self.videoItem.FPS;
-    [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
+    [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:self.mainRunLoopMode];
     self.forwardAnimating = !self.reversing;
 }
 
@@ -156,7 +156,7 @@
         }
         self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(next)];
         self.displayLink.frameInterval = 60 / self.videoItem.FPS;
-        [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
+        [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:self.mainRunLoopMode];
     }
 }
 
@@ -523,4 +523,11 @@
     return _dynamicDrawings;
 }
 
+- (NSRunLoopMode)mainRunLoopMode {
+    if (!_mainRunLoopMode) {
+        _mainRunLoopMode = NSRunLoopCommonModes;
+    }
+    return _mainRunLoopMode;
+}
+
 @end
diff --git a/Source/SVGAVideoEntity.m b/Source/SVGAVideoEntity.m
index 66ab2ec..cd63400 100644
--- a/Source/SVGAVideoEntity.m
+++ b/Source/SVGAVideoEntity.m
@@ -32,6 +32,7 @@
 
 static NSCache *videoCache;
 static NSMapTable * weakCache;
+static dispatch_semaphore_t videoSemaphore;
 
 + (void)load {
     static dispatch_once_t onceToken;
@@ -40,6 +41,7 @@ static NSMapTable * weakCache;
         weakCache = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory
         valueOptions:NSPointerFunctionsWeakMemory
             capacity:64];
+        videoSemaphore = dispatch_semaphore_create(1);
     });
 }
 
@@ -209,19 +211,26 @@ static NSMapTable * weakCache;
 }
 
 + (SVGAVideoEntity *)readCache:(NSString *)cacheKey {
+    dispatch_semaphore_wait(videoSemaphore, DISPATCH_TIME_FOREVER);
     SVGAVideoEntity * object = [videoCache objectForKey:cacheKey];
     if (!object) {
         object = [weakCache objectForKey:cacheKey];
     }
-    return object;
+    dispatch_semaphore_signal(videoSemaphore);
+
+    return  object;
 }
 
 - (void)saveCache:(NSString *)cacheKey {
+    dispatch_semaphore_wait(videoSemaphore, DISPATCH_TIME_FOREVER);
     [videoCache setObject:self forKey:cacheKey];
+    dispatch_semaphore_signal(videoSemaphore);
 }
 
 - (void)saveWeakCache:(NSString *)cacheKey {
+    dispatch_semaphore_wait(videoSemaphore, DISPATCH_TIME_FOREVER);
     [weakCache setObject:self forKey:cacheKey];
+    dispatch_semaphore_signal(videoSemaphore);
 }
 
 @end