For best results, disable compositing/desktop effects and use fullscreen.
Please state your hardware when posting:
On Windows: press Windows+R then type in "dxdiag" without the quotes. Generate a report, save it anywhere, then paste it on a site like this one.
On Linux: use something like the Phoronix Test Suite with the "system-info" argument. Copy the output of "phoronix-test-suite system-info" (Ctrl+Shift+C), then paste it on a site like this one.)
Please also state your graphic settings and resolution when posting (you can make a screenshot of your "options" menu and upload/attach it if you want).
Feel free to use the post below as a template for your post.