This is what I found on opera://gpu/ :
Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Rasterization: Software only, hardware acceleration unavailable
Threaded Rasterization: Enabled
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
WebGL: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
disable_d3d11
exit_on_context_lost
scalarize_vec_and_mat_constructor_args
texsubimage2d_faster_than_teximage2d
Problems Detected
GPU rasterization is blacklisted on non-Android: 362779
Disabled Features: gpu_rasterization
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage2D() is faster for full uploads on ANGLE
Applied Workarounds: texsubimage2d_faster_than_teximage2d
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
Disable Direct3D11 on systems with AMD switchable graphics: 451420
Applied Workarounds: disable_d3d11
And when I'm right clicking on video I have some Adobe flash player settings and some "About Adobe flash player" on the list, so I guess I'm using flash videos.
Thank you...