diff --git a/sdk/objc/components/audio/RTCAudioSessionConfiguration.h b/sdk/objc/components/audio/RTCAudioSessionConfiguration.h
index 4582b80557..6c6f808a32 100644
--- a/sdk/objc/components/audio/RTCAudioSessionConfiguration.h
+++ b/sdk/objc/components/audio/RTCAudioSessionConfiguration.h
@@ -17,9 +17,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 RTC_EXTERN const int kRTCAudioSessionPreferredNumberOfChannels;
 RTC_EXTERN const double kRTCAudioSessionHighPerformanceSampleRate;
-RTC_EXTERN const double kRTCAudioSessionLowComplexitySampleRate;
 RTC_EXTERN const double kRTCAudioSessionHighPerformanceIOBufferDuration;
-RTC_EXTERN const double kRTCAudioSessionLowComplexityIOBufferDuration;
 
 // Struct to hold configuration values.
 RTC_OBJC_EXPORT
diff --git a/sdk/objc/components/audio/RTCAudioSessionConfiguration.m b/sdk/objc/components/audio/RTCAudioSessionConfiguration.m
index 39e9ac13ec..71b0c0cb3a 100644
--- a/sdk/objc/components/audio/RTCAudioSessionConfiguration.m
+++ b/sdk/objc/components/audio/RTCAudioSessionConfiguration.m
@@ -30,10 +30,6 @@ const int kRTCAudioSessionPreferredNumberOfChannels = 1;
 // 8000Hz as native sample rate.
 const double kRTCAudioSessionHighPerformanceSampleRate = 48000.0;
 
-// A lower sample rate will be used for devices with only one core
-// (e.g. iPhone 4). The goal is to reduce the CPU load of the application.
-const double kRTCAudioSessionLowComplexitySampleRate = 16000.0;
-
 // Use a hardware I/O buffer size (unit is in seconds) that matches the 10ms
 // size used by WebRTC. The exact actual size will differ between devices.
 // Example: using 48kHz on iPhone 6 results in a native buffer size of
@@ -44,13 +40,6 @@ const double kRTCAudioSessionLowComplexitySampleRate = 16000.0;
 // callback sequence without bursts of callbacks back to back.
 const double kRTCAudioSessionHighPerformanceIOBufferDuration = 0.02;
 
-// Use a larger buffer size on devices with only one core (e.g. iPhone 4).
-// It will result in a lower CPU consumption at the cost of a larger latency.
-// The size of 60ms is based on instrumentation that shows a significant
-// reduction in CPU load compared with 10ms on low-end devices.
-// TODO(henrika): monitor this size and determine if it should be modified.
-const double kRTCAudioSessionLowComplexityIOBufferDuration = 0.06;
-
 static RTC_OBJC_TYPE(RTCAudioSessionConfiguration) *gWebRTCConfiguration = nil;
 
 @implementation RTC_OBJC_TYPE (RTCAudioSessionConfiguration)
@@ -75,20 +64,10 @@ static RTC_OBJC_TYPE(RTCAudioSessionConfiguration) *gWebRTCConfiguration = nil;
     // Specify mode for two-way voice communication (e.g. VoIP).
     _mode = AVAudioSessionModeVoiceChat;
 
-    // Set the session's sample rate or the hardware sample rate.
-    // It is essential that we use the same sample rate as stream format
-    // to ensure that the I/O unit does not have to do sample rate conversion.
-    // Set the preferred audio I/O buffer duration, in seconds.
-    NSUInteger processorCount = [NSProcessInfo processInfo].processorCount;
     // Use best sample rate and buffer duration if the CPU has more than one
     // core.
-    if (processorCount > 1 && [UIDevice deviceType] != RTCDeviceTypeIPhone4S) {
-      _sampleRate = kRTCAudioSessionHighPerformanceSampleRate;
-      _ioBufferDuration = kRTCAudioSessionHighPerformanceIOBufferDuration;
-    } else {
-      _sampleRate = kRTCAudioSessionLowComplexitySampleRate;
-      _ioBufferDuration = kRTCAudioSessionLowComplexityIOBufferDuration;
-    }
+    _sampleRate = kRTCAudioSessionHighPerformanceSampleRate;
+    _ioBufferDuration = kRTCAudioSessionHighPerformanceIOBufferDuration;
 
     // We try to use mono in both directions to save resources and format
     // conversions in the audio unit. Some devices does only support stereo;
diff --git a/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm b/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm
index 09e642bc37..3f30bb1e8a 100644
--- a/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm
+++ b/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm
@@ -246,9 +246,7 @@ void decompressionOutputCallback(void *decoderRef,
 - (void)destroyDecompressionSession {
   if (_decompressionSession) {
 #if defined(WEBRTC_IOS)
-    if ([UIDevice isIOS11OrLater]) {
-      VTDecompressionSessionWaitForAsynchronousFrames(_decompressionSession);
-    }
+    VTDecompressionSessionWaitForAsynchronousFrames(_decompressionSession);
 #endif
     VTDecompressionSessionInvalidate(_decompressionSession);
     CFRelease(_decompressionSession);
diff --git a/sdk/objc/helpers/UIDevice+RTCDevice.h b/sdk/objc/helpers/UIDevice+RTCDevice.h
index 1c5d228546..4d04f38f8c 100644
--- a/sdk/objc/helpers/UIDevice+RTCDevice.h
+++ b/sdk/objc/helpers/UIDevice+RTCDevice.h
@@ -10,103 +10,8 @@
 
 #import <UIKit/UIKit.h>
 
-typedef NS_ENUM(NSInteger, RTCDeviceType) {
-  RTCDeviceTypeUnknown,
-  RTCDeviceTypeIPhone1G,
-  RTCDeviceTypeIPhone3G,
-  RTCDeviceTypeIPhone3GS,
-  RTCDeviceTypeIPhone4,
-  RTCDeviceTypeIPhone4Verizon,
-  RTCDeviceTypeIPhone4S,
-  RTCDeviceTypeIPhone5GSM,
-  RTCDeviceTypeIPhone5GSM_CDMA,
-  RTCDeviceTypeIPhone5CGSM,
-  RTCDeviceTypeIPhone5CGSM_CDMA,
-  RTCDeviceTypeIPhone5SGSM,
-  RTCDeviceTypeIPhone5SGSM_CDMA,
-  RTCDeviceTypeIPhone6Plus,
-  RTCDeviceTypeIPhone6,
-  RTCDeviceTypeIPhone6S,
-  RTCDeviceTypeIPhone6SPlus,
-  RTCDeviceTypeIPhone7,
-  RTCDeviceTypeIPhone7Plus,
-  RTCDeviceTypeIPhoneSE,
-  RTCDeviceTypeIPhone8,
-  RTCDeviceTypeIPhone8Plus,
-  RTCDeviceTypeIPhoneX,
-  RTCDeviceTypeIPhoneXS,
-  RTCDeviceTypeIPhoneXSMax,
-  RTCDeviceTypeIPhoneXR,
-  RTCDeviceTypeIPhone11,
-  RTCDeviceTypeIPhone11Pro,
-  RTCDeviceTypeIPhone11ProMax,
-  RTCDeviceTypeIPhone12Mini,
-  RTCDeviceTypeIPhone12,
-  RTCDeviceTypeIPhone12Pro,
-  RTCDeviceTypeIPhone12ProMax,
-  RTCDeviceTypeIPhoneSE2Gen,
-  RTCDeviceTypeIPhone13,
-  RTCDeviceTypeIPhone13Mini,
-  RTCDeviceTypeIPhone13Pro,
-  RTCDeviceTypeIPhone13ProMax,
-
-  RTCDeviceTypeIPodTouch1G,
-  RTCDeviceTypeIPodTouch2G,
-  RTCDeviceTypeIPodTouch3G,
-  RTCDeviceTypeIPodTouch4G,
-  RTCDeviceTypeIPodTouch5G,
-  RTCDeviceTypeIPodTouch6G,
-  RTCDeviceTypeIPodTouch7G,
-  RTCDeviceTypeIPad,
-  RTCDeviceTypeIPad2Wifi,
-  RTCDeviceTypeIPad2GSM,
-  RTCDeviceTypeIPad2CDMA,
-  RTCDeviceTypeIPad2Wifi2,
-  RTCDeviceTypeIPadMiniWifi,
-  RTCDeviceTypeIPadMiniGSM,
-  RTCDeviceTypeIPadMiniGSM_CDMA,
-  RTCDeviceTypeIPad3Wifi,
-  RTCDeviceTypeIPad3GSM_CDMA,
-  RTCDeviceTypeIPad3GSM,
-  RTCDeviceTypeIPad4Wifi,
-  RTCDeviceTypeIPad4GSM,
-  RTCDeviceTypeIPad4GSM_CDMA,
-  RTCDeviceTypeIPad5,
-  RTCDeviceTypeIPad6,
-  RTCDeviceTypeIPadAirWifi,
-  RTCDeviceTypeIPadAirCellular,
-  RTCDeviceTypeIPadAirWifiCellular,
-  RTCDeviceTypeIPadAir2,
-  RTCDeviceTypeIPadMini2GWifi,
-  RTCDeviceTypeIPadMini2GCellular,
-  RTCDeviceTypeIPadMini2GWifiCellular,
-  RTCDeviceTypeIPadMini3,
-  RTCDeviceTypeIPadMini4,
-  RTCDeviceTypeIPadPro9Inch,
-  RTCDeviceTypeIPadPro12Inch,
-  RTCDeviceTypeIPadPro12Inch2,
-  RTCDeviceTypeIPadPro10Inch,
-  RTCDeviceTypeIPad7Gen10Inch,
-  RTCDeviceTypeIPadPro3Gen11Inch,
-  RTCDeviceTypeIPadPro3Gen12Inch,
-  RTCDeviceTypeIPadPro4Gen11Inch,
-  RTCDeviceTypeIPadPro4Gen12Inch,
-  RTCDeviceTypeIPadMini5Gen,
-  RTCDeviceTypeIPadAir3Gen,
-  RTCDeviceTypeIPad8,
-  RTCDeviceTypeIPad9,
-  RTCDeviceTypeIPadMini6,
-  RTCDeviceTypeIPadAir4Gen,
-  RTCDeviceTypeIPadPro5Gen11Inch,
-  RTCDeviceTypeIPadPro5Gen12Inch,
-  RTCDeviceTypeSimulatori386,
-  RTCDeviceTypeSimulatorx86_64,
-};
-
 @interface UIDevice (RTCDevice)
 
 + (NSString *)machineName;
-+ (RTCDeviceType)deviceType;
-+ (BOOL)isIOS11OrLater;
 
 @end
diff --git a/sdk/objc/helpers/UIDevice+RTCDevice.mm b/sdk/objc/helpers/UIDevice+RTCDevice.mm
index 77a5d79f79..f3c21991b8 100644
--- a/sdk/objc/helpers/UIDevice+RTCDevice.mm
+++ b/sdk/objc/helpers/UIDevice+RTCDevice.mm
@@ -15,144 +15,6 @@
 
 @implementation UIDevice (RTCDevice)
 
-+ (RTCDeviceType)deviceType {
-  NSDictionary *machineNameToType = @{
-    @"iPhone1,1" : @(RTCDeviceTypeIPhone1G),
-    @"iPhone1,2" : @(RTCDeviceTypeIPhone3G),
-    @"iPhone2,1" : @(RTCDeviceTypeIPhone3GS),
-    @"iPhone3,1" : @(RTCDeviceTypeIPhone4),
-    @"iPhone3,2" : @(RTCDeviceTypeIPhone4),
-    @"iPhone3,3" : @(RTCDeviceTypeIPhone4Verizon),
-    @"iPhone4,1" : @(RTCDeviceTypeIPhone4S),
-    @"iPhone5,1" : @(RTCDeviceTypeIPhone5GSM),
-    @"iPhone5,2" : @(RTCDeviceTypeIPhone5GSM_CDMA),
-    @"iPhone5,3" : @(RTCDeviceTypeIPhone5CGSM),
-    @"iPhone5,4" : @(RTCDeviceTypeIPhone5CGSM_CDMA),
-    @"iPhone6,1" : @(RTCDeviceTypeIPhone5SGSM),
-    @"iPhone6,2" : @(RTCDeviceTypeIPhone5SGSM_CDMA),
-    @"iPhone7,1" : @(RTCDeviceTypeIPhone6Plus),
-    @"iPhone7,2" : @(RTCDeviceTypeIPhone6),
-    @"iPhone8,1" : @(RTCDeviceTypeIPhone6S),
-    @"iPhone8,2" : @(RTCDeviceTypeIPhone6SPlus),
-    @"iPhone8,4" : @(RTCDeviceTypeIPhoneSE),
-    @"iPhone9,1" : @(RTCDeviceTypeIPhone7),
-    @"iPhone9,2" : @(RTCDeviceTypeIPhone7Plus),
-    @"iPhone9,3" : @(RTCDeviceTypeIPhone7),
-    @"iPhone9,4" : @(RTCDeviceTypeIPhone7Plus),
-    @"iPhone10,1" : @(RTCDeviceTypeIPhone8),
-    @"iPhone10,2" : @(RTCDeviceTypeIPhone8Plus),
-    @"iPhone10,3" : @(RTCDeviceTypeIPhoneX),
-    @"iPhone10,4" : @(RTCDeviceTypeIPhone8),
-    @"iPhone10,5" : @(RTCDeviceTypeIPhone8Plus),
-    @"iPhone10,6" : @(RTCDeviceTypeIPhoneX),
-    @"iPhone11,2" : @(RTCDeviceTypeIPhoneXS),
-    @"iPhone11,4" : @(RTCDeviceTypeIPhoneXSMax),
-    @"iPhone11,6" : @(RTCDeviceTypeIPhoneXSMax),
-    @"iPhone11,8" : @(RTCDeviceTypeIPhoneXR),
-    @"iPhone12,1" : @(RTCDeviceTypeIPhone11),
-    @"iPhone12,3" : @(RTCDeviceTypeIPhone11Pro),
-    @"iPhone12,5" : @(RTCDeviceTypeIPhone11ProMax),
-    @"iPhone12,8" : @(RTCDeviceTypeIPhoneSE2Gen),
-    @"iPhone13,1" : @(RTCDeviceTypeIPhone12Mini),
-    @"iPhone13,2" : @(RTCDeviceTypeIPhone12),
-    @"iPhone13,3" : @(RTCDeviceTypeIPhone12Pro),
-    @"iPhone13,4" : @(RTCDeviceTypeIPhone12ProMax),
-    @"iPhone14,5" : @(RTCDeviceTypeIPhone13),
-    @"iPhone14,4" : @(RTCDeviceTypeIPhone13Mini),
-    @"iPhone14,2" : @(RTCDeviceTypeIPhone13Pro),
-    @"iPhone14,3" : @(RTCDeviceTypeIPhone13ProMax),
-    @"iPod1,1" : @(RTCDeviceTypeIPodTouch1G),
-    @"iPod2,1" : @(RTCDeviceTypeIPodTouch2G),
-    @"iPod3,1" : @(RTCDeviceTypeIPodTouch3G),
-    @"iPod4,1" : @(RTCDeviceTypeIPodTouch4G),
-    @"iPod5,1" : @(RTCDeviceTypeIPodTouch5G),
-    @"iPod7,1" : @(RTCDeviceTypeIPodTouch6G),
-    @"iPod9,1" : @(RTCDeviceTypeIPodTouch7G),
-    @"iPad1,1" : @(RTCDeviceTypeIPad),
-    @"iPad2,1" : @(RTCDeviceTypeIPad2Wifi),
-    @"iPad2,2" : @(RTCDeviceTypeIPad2GSM),
-    @"iPad2,3" : @(RTCDeviceTypeIPad2CDMA),
-    @"iPad2,4" : @(RTCDeviceTypeIPad2Wifi2),
-    @"iPad2,5" : @(RTCDeviceTypeIPadMiniWifi),
-    @"iPad2,6" : @(RTCDeviceTypeIPadMiniGSM),
-    @"iPad2,7" : @(RTCDeviceTypeIPadMiniGSM_CDMA),
-    @"iPad3,1" : @(RTCDeviceTypeIPad3Wifi),
-    @"iPad3,2" : @(RTCDeviceTypeIPad3GSM_CDMA),
-    @"iPad3,3" : @(RTCDeviceTypeIPad3GSM),
-    @"iPad3,4" : @(RTCDeviceTypeIPad4Wifi),
-    @"iPad3,5" : @(RTCDeviceTypeIPad4GSM),
-    @"iPad3,6" : @(RTCDeviceTypeIPad4GSM_CDMA),
-    @"iPad4,1" : @(RTCDeviceTypeIPadAirWifi),
-    @"iPad4,2" : @(RTCDeviceTypeIPadAirCellular),
-    @"iPad4,3" : @(RTCDeviceTypeIPadAirWifiCellular),
-    @"iPad4,4" : @(RTCDeviceTypeIPadMini2GWifi),
-    @"iPad4,5" : @(RTCDeviceTypeIPadMini2GCellular),
-    @"iPad4,6" : @(RTCDeviceTypeIPadMini2GWifiCellular),
-    @"iPad4,7" : @(RTCDeviceTypeIPadMini3),
-    @"iPad4,8" : @(RTCDeviceTypeIPadMini3),
-    @"iPad4,9" : @(RTCDeviceTypeIPadMini3),
-    @"iPad5,1" : @(RTCDeviceTypeIPadMini4),
-    @"iPad5,2" : @(RTCDeviceTypeIPadMini4),
-    @"iPad5,3" : @(RTCDeviceTypeIPadAir2),
-    @"iPad5,4" : @(RTCDeviceTypeIPadAir2),
-    @"iPad6,3" : @(RTCDeviceTypeIPadPro9Inch),
-    @"iPad6,4" : @(RTCDeviceTypeIPadPro9Inch),
-    @"iPad6,7" : @(RTCDeviceTypeIPadPro12Inch),
-    @"iPad6,8" : @(RTCDeviceTypeIPadPro12Inch),
-    @"iPad6,11" : @(RTCDeviceTypeIPad5),
-    @"iPad6,12" : @(RTCDeviceTypeIPad5),
-    @"iPad7,1" : @(RTCDeviceTypeIPadPro12Inch2),
-    @"iPad7,2" : @(RTCDeviceTypeIPadPro12Inch2),
-    @"iPad7,3" : @(RTCDeviceTypeIPadPro10Inch),
-    @"iPad7,4" : @(RTCDeviceTypeIPadPro10Inch),
-    @"iPad7,5" : @(RTCDeviceTypeIPad6),
-    @"iPad7,6" : @(RTCDeviceTypeIPad6),
-    @"iPad7,11" : @(RTCDeviceTypeIPad7Gen10Inch),
-    @"iPad7,12" : @(RTCDeviceTypeIPad7Gen10Inch),
-    @"iPad8,1" : @(RTCDeviceTypeIPadPro3Gen11Inch),
-    @"iPad8,2" : @(RTCDeviceTypeIPadPro3Gen11Inch),
-    @"iPad8,3" : @(RTCDeviceTypeIPadPro3Gen11Inch),
-    @"iPad8,4" : @(RTCDeviceTypeIPadPro3Gen11Inch),
-    @"iPad8,5" : @(RTCDeviceTypeIPadPro3Gen12Inch),
-    @"iPad8,6" : @(RTCDeviceTypeIPadPro3Gen12Inch),
-    @"iPad8,7" : @(RTCDeviceTypeIPadPro3Gen12Inch),
-    @"iPad8,8" : @(RTCDeviceTypeIPadPro3Gen12Inch),
-    @"iPad8,9" : @(RTCDeviceTypeIPadPro4Gen11Inch),
-    @"iPad8,10" : @(RTCDeviceTypeIPadPro4Gen11Inch),
-    @"iPad8,11" : @(RTCDeviceTypeIPadPro4Gen12Inch),
-    @"iPad8,12" : @(RTCDeviceTypeIPadPro4Gen12Inch),
-    @"iPad11,1" : @(RTCDeviceTypeIPadMini5Gen),
-    @"iPad11,2" : @(RTCDeviceTypeIPadMini5Gen),
-    @"iPad11,3" : @(RTCDeviceTypeIPadAir3Gen),
-    @"iPad11,4" : @(RTCDeviceTypeIPadAir3Gen),
-    @"iPad11,6" : @(RTCDeviceTypeIPad8),
-    @"iPad11,7" : @(RTCDeviceTypeIPad8),
-    @"iPad12,1" : @(RTCDeviceTypeIPad9),
-    @"iPad12,2" : @(RTCDeviceTypeIPad9),
-    @"iPad13,1" : @(RTCDeviceTypeIPadAir4Gen),
-    @"iPad13,2" : @(RTCDeviceTypeIPadAir4Gen),
-    @"iPad13,4" : @(RTCDeviceTypeIPadPro5Gen11Inch),
-    @"iPad13,5" : @(RTCDeviceTypeIPadPro5Gen11Inch),
-    @"iPad13,6" : @(RTCDeviceTypeIPadPro5Gen11Inch),
-    @"iPad13,7" : @(RTCDeviceTypeIPadPro5Gen11Inch),
-    @"iPad13,8" : @(RTCDeviceTypeIPadPro5Gen12Inch),
-    @"iPad13,9" : @(RTCDeviceTypeIPadPro5Gen12Inch),
-    @"iPad13,10" : @(RTCDeviceTypeIPadPro5Gen12Inch),
-    @"iPad13,11" : @(RTCDeviceTypeIPadPro5Gen12Inch),
-    @"iPad14,1" : @(RTCDeviceTypeIPadMini6),
-    @"iPad14,2" : @(RTCDeviceTypeIPadMini6),
-    @"i386" : @(RTCDeviceTypeSimulatori386),
-    @"x86_64" : @(RTCDeviceTypeSimulatorx86_64),
-  };
-
-  RTCDeviceType deviceType = RTCDeviceTypeUnknown;
-  NSNumber *typeNumber = machineNameToType[[self machineName]];
-  if (typeNumber) {
-    deviceType = static_cast<RTCDeviceType>(typeNumber.integerValue);
-  }
-  return deviceType;
-}
-
 + (NSString *)machineName {
   struct utsname systemInfo;
   uname(&systemInfo);
@@ -160,12 +22,4 @@
                                   encoding:NSUTF8StringEncoding];
 }
 
-+ (double)currentDeviceSystemVersion {
-  return [self currentDevice].systemVersion.doubleValue;
-}
-
-+ (BOOL)isIOS11OrLater {
-  return [self currentDeviceSystemVersion] >= 11.0;
-}
-
 @end