Some things to try
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts). Like DJBarry said, you might be missing some stuff. New prebuilt computers are sometimes (read as usually) missing something
2) Make sure under Power Management in Windows you're running in High Performance. Also set your GPU to run at high performance: https://forums.dolphin-emu.org/Thread-un...ance+guide
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-780
You might also want to look at upgrading to Windows 8.1
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts). Like DJBarry said, you might be missing some stuff. New prebuilt computers are sometimes (read as usually) missing something
2) Make sure under Power Management in Windows you're running in High Performance. Also set your GPU to run at high performance: https://forums.dolphin-emu.org/Thread-un...ance+guide
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-780
You might also want to look at upgrading to Windows 8.1