It is not, ext4 does circles around piece of junk ntfs and I've got the load times from my own old world of warships install to prove it.
Windows gg ez'd its way out of making a better filesystem with the advent of SSDs which doesn't have performance hits from fragmenting like a spinning disk does.
I still remember running defraggler every few months just so I could play Batman Arkham Knight on Windows, otherwise the game would freeze lag and run at a ridiculous 10 FPS.
Windows also eats 2GB RAM at idle for no reason compared to usually 1.3-1.4 for KDE and 1.0 flat for XFCE. Zswap/Zram also helps a lot when you don't have an SSD.
And to top it off, Compiz, Wayfire, KWin, etc all outperform Windows's desktop compositor by miles in terms of performance and visual snappiness. Windows lags heavily on anything mobile like a light laptop or tablet, yet you can run a full transparent 3D compiz cube no problem with basically no hit to hardware usage due to its use of OpenGL.