[ONE Android Development] Timmmmaaahh!:
Now that you mention it, I also had a massive lag after rebooting the second or third time while setting up apps, adblocking and so on. Rebooting took 1-2 minutes while the boot animation usually only appears a few seconds. It all returned to normal after another reboot and has been running smooth and stable since then.

You're excused for the report but not for the fact that you didn't include any logs :p Allow me:

10-23 09:22:56.810 I/ActivityManager( 624): START u0 {act=com.google.android.gms.trustlet.face.ui.FaceUnlockSettingsActivity.START pkg=com.google.android.gms cmp=com.google.android.gms/.trustagent.GoogleTrustAgentFaceUnlockSettings} from uid 10030
10-23 09:22:56.862 W/System ( 4319): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.863 E/BoostFramework( 4319): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.863 W/System ( 4319): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.865 E/BoostFramework( 4319): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.875 I/ActivityManager( 624): START u0 {cmp=com.android.facelock/.SetupIntro (has extras)} from uid 10030
10-23 09:22:56.884 W/System ( 4319): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.884 E/BoostFramework( 4319): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.884 W/System ( 4319): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.885 E/BoostFramework( 4319): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.903 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.904 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.904 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:56.904 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:56.939 W/Adreno-EGL( 4978): <qeglDrvAPI_eglGetConfigAttrib:607>: EGL_BAD_ATTRIBUTE
10-23 09:22:56.942 I/RenderThread( 5000): type=1400 audit(0.0:562): avc: denied { ioctl } for path="/dev/kgsl-3d0" dev="tmpfs" ino=7405 ioctlcmd=93d scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:device:s0 tclass=chr_file permissive=1
10-23 09:22:56.952 I/RenderThread( 5000): type=1400 audit(0.0:564): avc: denied { read write } for path="/dev/kgsl-3d0" dev="tmpfs" ino=7405 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:device:s0 tclass=chr_file permissive=1
10-23 09:22:56.990 I/ActivityManager( 624): Displayed com.android.facelock/.SetupIntro: +79ms (total +137ms)
10-23 09:22:58.090 I/ActivityManager( 624): START u0 {flg=0x2000000 cmp=com.android.facelock/.SetupInstructionsScreen} from uid 10073
10-23 09:22:58.136 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:58.136 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:58.137 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:58.137 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:58.183 W/Adreno-EGL( 4978): <qeglDrvAPI_eglGetConfigAttrib:607>: EGL_BAD_ATTRIBUTE
10-23 09:22:58.234 I/ActivityManager( 624): Displayed com.android.facelock/.SetupInstructionsScreen: +108ms
10-23 09:22:58.239 D/OpenGLRenderer( 4978): endAllActiveAnimators on 0x94c17700 (RippleDrawable) with handle 0xae71f320
10-23 09:22:59.425 I/ActivityManager( 624): START u0 {flg=0x2000000 cmp=com.android.facelock/.SetupEnrollmentScreen (has extras)} from uid 10073
10-23 09:22:59.545 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.546 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.546 W/System ( 4978): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.547 E/BoostFramework( 4978): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.565 D/AndroidRuntime( 4978): Shutting down VM
--------- beginning of crash
10-23 09:22:59.569 E/AndroidRuntime( 4978): FATAL EXCEPTION: main
10-23 09:22:59.569 E/AndroidRuntime( 4978): Process: com.android.facelock, PID: 4978
10-23 09:22:59.569 E/AndroidRuntime( 4978): java.lang.UnsatisfiedLinkError: dlopen failed: "/system/lib/libfacenet.so" is 64-bit instead of 32-bit
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at java.lang.System.loadLibrary(System.java:1657)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.google.android.libraries.vision.facenet.FaceNet.<clinit>(FaceNet.java:67)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.google.android.libraries.vision.facenet.FaceNet.createFromAssets(FaceNet.java:118)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.android.facelock.FaceLockUtil.initialize(FaceLockUtil.java:148)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.android.facelock.SetupEnrollmentScreen.onCreate(SetupEnrollmentScreen.java:517)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.Activity.performCreate(Activity.java:7020)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.ActivityThread.-wrap11(Unknown Source:0)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.os.Handler.dispatchMessage(Handler.java:105)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.os.Looper.loop(Looper.java:164)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at android.app.ActivityThread.main(ActivityThread.java:6541)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at java.lang.reflect.Method.invoke(Native Method)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
10-23 09:22:59.569 E/AndroidRuntime( 4978):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
10-23 09:22:59.573 W/ActivityManager( 624): Force finishing activity com.android.facelock/.SetupEnrollmentScreen
10-23 09:22:59.578 W/ContextImpl( 624): Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:950 com.android.server.am.AppErrors.crashApplicationInner:393 com.android.server.am.AppErrors.crashApplication:321 com.android.server.am.ActivityManagerService.handleApplicationCrashInner:14293 com.android.server.am.ActivityManagerService.handleApplicationCrash:14275
10-23 09:22:59.580 I/ActivityManager( 624): Showing crash dialog for package com.android.facelock u0
10-23 09:22:59.590 W/System ( 624): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.591 E/BoostFramework( 624): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.591 W/System ( 624): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.591 E/BoostFramework( 624): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.600 W/System ( 624): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.601 E/BoostFramework( 624): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.601 W/System ( 624): ClassLoader referenced unknown path: /system/framework/QPerformance.jar
10-23 09:22:59.602 E/BoostFramework( 624): BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /system/vendor/lib]]
10-23 09:22:59.637 W/Adreno-EGL( 624): <qeglDrvAPI_eglGetConfigAttrib:607>: EGL_BAD_ATTRIBUTE
10-23 09:23:00.075 W/ActivityManager( 624): Activity pause timeout for ActivityRecord{4d93dd6 u0 com.android.facelock/.SetupEnrollmentScreen t326 f}
10-23 09:23:00.165 W/Adreno-EGL( 4319): <qeglDrvAPI_eglGetConfigAttrib:607>: EGL_BAD_ATTRIBUTE
10-23 09:23:00.287 I/TrustAgent( 1403): [VoiceUnlockTrustletChimeraService] #isSupported true
10-23 09:23:00.923 W/ActivityManager( 624): Force finishing activity com.android.facelock/.SetupEnrollmentScreen
10-23 09:23:00.924 W/ActivityManager( 624): Force finishing activity com.android.facelock/.SetupInstructionsScreen
10-23 09:23:00.977 I/ActivityManager( 624): Killing 4978:com.android.facelock/u0a73 (adj 900): crash
10-23 09:23:01.020 W/ActivityManager( 624): setHasOverlayUi called on unknown pid: 4978
10-23 09:23:01.049 E/FullInputEventModel( 1725): onStartInput event aborted: com.touchtype.keyboard.e.p: could not obtain extracted text (class com.touchtype.keyboard.e.p)
10-23 09:23:01.051 W/InputEventReceiver( 624): Attempted to finish an input event but the input event receiver has already been disposed.
10-23 09:23:01.052 W/ViewRootImpl[facelock]( 624): Dropping event due to root view being removed: MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=558.4579, y[0]=-698.3197, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=4, eventTime=115661, downTime=115549, deviceId=5, source=0x1002 }
10-23 09:23:01.162 W/AppOps ( 624): Finishing op nesting under-run: uid 1000 pkg android code 24 time=0 duration=0 nesting=0
10-23 09:23:01.892 D/StatusBar( 1013): disable<e i a s b h r c s q >
10-23 09:23:01.925 W/Adreno-EGL( 1013): <qeglDrvAPI_eglGetConfigAttrib:607>: EGL_BAD_ATTRIBUTE
10-23 09:23:01.983 D/StatusBar( 1013): disable<e i a s b h r c s q >
10-23 09:23:02.005 I/mpdecision( 1365): type=1400 audit(0.0:568): avc: denied { read } for scontext=u:r:init:s0 tcontext=u:r:init:s0 tclass=netlink_kobject_uevent_socket permissive=1