UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. Connect two monitors to one graphics card
2. "Duplicate" the screen in the Windows settings (GTX 970)
3. Open YouTube or Twitch and watch a fullscreen video --> lagging.

What is the expected behavior?
It should not lag.

What went wrong?
There are numerous threads on the Internet on the subject of "Fullscreen lay YouTube/Twitch in Google Chrome", and any solution suggestions are suboptimal or do not even contribute to problem solving.

The error does not result from Adobe Flash or activated hardware acceleration, but from two monitors plugged on one graphics card, which were configured in Windows as "duplicated".

If the Windows settings are configured to only one monitor (Two monitors can still be connected to the graphics card), the bug no longer occurs and videos run smoothly in full-screen mode on YouTube or Twitch.

I suspect the problem is Nvidia-specific, since the bug did not occur on my old R9 270X, but on my GTX 970.

Did this work before? No 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes

Chrome version: 63.0.3239.132  Channel: stable
OS Version: 10.0
Flash Version: 

Contents of chrome://gpu: 
Note: To properly save this page, select the "Webpage, Complete" option in the Save File dialog.
Graphics Feature Status
Canvas: Hardware accelerated
CheckerImaging: Disabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Hardware accelerated
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
decode_encode_srgb_for_generatemipmap
disable_delayed_copy_nv12
disable_discard_framebuffer
disable_dxgi_zero_copy_video
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage
Problems Detected
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage is faster for full uploads on ANGLE
Applied Workarounds: texsubimage_faster_than_teximage
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
ANGLE crash on glReadPixels from incomplete cube map texture: 518889
Applied Workarounds: force_cube_complete
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
Zero-copy NV12 video displays incorrect colors on NVIDIA drivers.: 635319
Applied Workarounds: disable_dxgi_zero_copy_video
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
Decode and Encode before generateMipmap for srgb format textures on Windows: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Delayed copy NV12 displays incorrect colors on NVIDIA drivers.: 728670
Applied Workarounds: disable_delayed_copy_nv12
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Checker-imaging has been disabled via finch trial or the command line.
Disabled Features: checker_imaging
Version Information
Data exported	12.2.2018, 12:41:00
Chrome version	Chrome/63.0.3239.132
Operating system	Windows NT 10.0.16299
Software rendering list version	0
Driver bug list version	10.34
ANGLE commit id	2ff870db3a3b
2D graphics backend	Skia/63 dbae7001c9805fb0a4b18fd0cbc889941cb39db4-
Command Line	"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --flag-switches-begin --ignore-gpu-blacklist --flag-switches-end
Driver Information
Initialization time	170
In-process GPU	false
Passthrough Command Decoder	false
Supports overlays	false
Sandboxed	false
GPU0	VENDOR = 0x10de, DEVICE= 0x13c2
Optimus	false
Optimus	false
AMD switchable	false
Desktop compositing	Aero Glass
Diagonal Monitor Size of \\.\DISPLAY1	23.5"
Diagonal Monitor Size of \\.\DISPLAY2	23.5"
Diagonal Monitor Size of \\.\DISPLAY3	23.5"
Diagonal Monitor Size of \\.\DISPLAY4	23.5"
Diagonal Monitor Size of \\.\DISPLAY1	27.0"
Driver vendor	NVIDIA
Driver version	23.21.13.8813
Driver date	10-27-2017
Pixel shader version	5.0
Vertex shader version	5.0
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	Google Inc.
GL_RENDERER	ANGLE (NVIDIA GeForce GTX 970 Direct3D11 vs_5_0 ps_5_0)
GL_VERSION	OpenGL ES 3.0 (ANGLE 2.1.0.2ff870db3a3b)
GL_EXTENSIONS	GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_multiview GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Window system binding vendor	Google Inc. (adapter LUID: 000000000000748e)
Window system binding version	1.4 (ANGLE 2.1.0.2ff870db3a3b)
Window system binding extensions	EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
Compositor Information
Tile Update Mode	One-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	Software only
BGRX_8888	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Display(s) Information
Info	Display[2528732444] bounds=0,0 1920x1080, workarea=0,0 1920x1040, scale=1, external
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL, icc_profile_id:10}
Bits per color component	8
Bits per pixel	24
Diagnostics
0
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	false
bDriverDebug	false
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	12
dwHeight	1080
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1920
iAdapter	0
lDriverSize	945072
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	Aktiviert
szChipType	GeForce GTX 970
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	Aktiviert
szDACType	Integrated RAMDAC
szDDIVersionEnglish	12
szDDIVersionLocalized	12
szDDStatusEnglish	Enabled
szDDStatusLocalized	Aktiviert
szDXVAHDEnglish	Supported
szDXVAModes	
szDescription	NVIDIA GeForce GTX 970
szDeviceId	0x13C2
szDeviceIdentifier	{D7B71E3E-5082-11CF-BF55-6D111BC2DA35}
szDeviceName	\\.\DISPLAY1
szDisplayMemoryEnglish	8132 MB
szDisplayMemoryLocalized	8132 MB
szDisplayModeEnglish	1920 x 1080 (32 bit) (60Hz)
szDisplayModeLocalized	1920 x 1080 (32 bit) (60Hz)
szDriverAssemblyVersion	23.21.13.8813
szDriverAttributes	Final Retail
szDriverDateEnglish	27.10.2017 01:00:00
szDriverDateLocalized	10/27/2017 01:00:00
szDriverLanguageEnglish	English
szDriverLanguageLocalized	Englisch
szDriverModelEnglish	WDDM 2.3
szDriverModelLocalized	WDDM 2.3
szDriverName	C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_2e7fa54192fe16d0\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_2e7fa54192fe16d0\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_2e7fa54192fe16d0\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_2e7fa54192fe16d0\nvldumdx.dll
szDriverNodeStrongName	oem35.inf:0f066de3ad0bda5c:Section110:23.21.13.8813:pci\ven_10de&dev_13c2
szDriverSignDate	Unknown
szDriverVersion	23.21.0013.8813
szKeyDeviceID	Enum\PCI\VEN_10DE&DEV_13C2&SUBSYS_31601462&REV_A1
szKeyDeviceKey	\Registry\Machine\System\CurrentControlSet\Control\Video\{ECC3C847-B599-11E7-87B9-8072952BC7EF}\0000
szManufacturer	NVIDIA
szMiniVdd	Unbekannt
szMiniVddDateEnglish	Unknown
szMiniVddDateLocalized	Unbekannt
szMonitorMaxRes	Unknown
szMonitorName	Generic PnP Monitor
szNotesEnglish	No problems found.
szNotesLocalized	Es wurden keine Probleme gefunden.
szOverlayEnglish	Supported
szRankOfInstalledDriver	00D12001
szRegHelpText	Unknown
szRevision	Unknown
szRevisionId	0x00A1
szSubSysId	0x31601462
szTestResultD3D7English	Not run
szTestResultD3D7Localized	Nicht ausgeführt
szTestResultD3D8English	Not run
szTestResultD3D8Localized	Nicht ausgeführt
szTestResultD3D9English	Not run
szTestResultD3D9Localized	Nicht ausgeführt
szTestResultDDEnglish	Not run
szTestResultDDLocalized	Nicht ausgeführt
szVdd	Unbekannt
szVendorId	0x10DE
Log Messages
[7396:7736:0212/120833.535:WARNING:angle_platform_impl.cc(51)] : rx::HLSLCompiler::compileToBinary(228): C:\fakepath(64,8-58): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them C:\fakepath(73,9-43): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them
[7396:10164:0212/120938.486:ERROR:dxva_picture_buffer_win.cc(24)] : Error in dxva_picture_buffer_win.cc on line 826
[7396:10164:0212/120941.503:ERROR:dxva_picture_buffer_win.cc(24)] : Error in dxva_picture_buffer_win.cc on line 826
[7396:10164:0212/120942.986:ERROR:dxva_picture_buffer_win.cc(24)] : Error in dxva_picture_buffer_win.cc on line 826
[7396:10164:0212/120946.003:ERROR:dxva_picture_buffer_win.cc(24)] : Error in dxva_picture_buffer_win.cc on line 826
[7396:10164:0212/121354.863:ERROR:mf_helpers.cc(14)] : Error in dxva_video_decode_accelerator_win.cc on line 1615
[7396:10164:0212/121354.863:ERROR:mf_helpers.cc(14)] : Error in dxva_video_decode_accelerator_win.cc on line 694
[7396:10164:0212/121354.875:ERROR:gpu_video_decode_accelerator.cc(367)] : HW video decode not available for profile vp9 profile0
[7396:10164:0212/123954.497:ERROR:gles2_cmd_decoder.cc(17977)] : [.RenderWorker-00000294F7596860.GpuRasterization]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[7396:10164:0212/123954.501:ERROR:gles2_cmd_decoder.cc(17977)] : [.RenderWorker-00000294F7596860.GpuRasterization]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.