GNOME forces OpenGL 3D compositing with no way to turn off, which is very uncomfortable without a GPU. Every other X11 desktop environment allows to turn them off, which is more tolerable when using llvmpipe, the software CPU Mesa OpenGL implementation.
GNOME forces OpenGL 3D compositing with no way to turn off, which is very uncomfortable without a GPU. Every other X11 desktop environment allows to turn them off, which is more tolerable when using llvmpipe, the software CPU Mesa OpenGL implementation.
While I've never used GNOME inside a KasmVNC session, it used to feel slow on reasonably powerful machines in an Xrdp session.
That'd be my first guess.