Linux users can apply specific tweaks via the Client java options in the launcher settings to improve rendering or memory usage:
Enable OpenGL
Use this flag to enable OpenGL rendering:
-Dsun.java2d.opengl=true
Note: There is a known bug with the file chooser when OpenGL is enabled. If using the i3 window manager, you can work around this by toggling the window's "floating" capability to force a re-render.
Enable XRender
Use this flag to enable XRender:
-Dsun.java2d.xrender=true
Increase Memory Usage
You can increase the maximum heap size if you have sufficient RAM. For example, to set it to 2GB:
-Xmx2G
-Dsun.java2d.opengl=true
-Dsun.java2d.xrender=true
-Xmx2G