Video player high CPU usage

I need to play a video file with ffplay in fullscreen mode. The original file has 720x576 resolution, my display is at 1920x1080.

When I launch ffplay as ffplay "filename.avi" and upscale it by maximizing its window, the resulting video looks pixelated. I think this is related to default image scaling algorithm used by ffplay.

When I launch it as ffplay "filename.avi" -vf scale=1920x1080:sws_flags=lanczos+accurate_d+full_chroma_int+full_chroma_inp and maximize the window, the result looks much better (anti-aliased, smooth edges), but CPU usage is at 25%.

At the same time, when I watch the same video in Windows Media Player, the result is as good as when upscaling the video in ffplay, but CPU usage is less than 5%.

How can I achieve the same result with ffplay?

Maybe it's because Windows Media Player upscales the video with GPU? If so, can ffplay use GPU too?