szo sends word of a new release of QuakeSpasm with a myriad of bug fixes and improvements, including:

• Use multithreaded OpenGL on OS X for better performance.
• New, faster mdl renderer using GLSL. Disable with “-noglslalias”.
• Use high-quality water by default (r_oldwater 0).
• Support pausing demo playback with the “pause” command.
• Experimental windowed fullscreen mode available with
  vid_desktopfullscreen 1 (only in SDL2 builds, takes effect upon
  entering fullscreen mode the next time.)

Go check out the rest of the change list!