Using Mozilla browsers, it's possible to hack xul.dll to call IDirect3D9::CreateDevice with a different adapter number, binding the browser to another non-primary display, so it will run fine on the one that was chosen (but not the others). Rendering is normally off-loaded to GPU and DirectX on XP has an awful characteristic that when application's window in which it's used is moved to another screen makes some slow copying process going on constantly in the background, slowing everything down. The biggest performance killer on XP is running the browser on secondary screen.
There's a difference in how fast a web pages appear, albeit not dramatic. Things render a bit faster on newer OS for me, one apparent example being HexGL game for instance which runs choppy on XP (圆4) for me, even though ANGLE is disabled and NVIDIA's drivers are generally good at OpenGL. It shouldn't be that bad as the OP describes due to an OS.
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