NEWT currently misses "Fullscreen Exclusive Mode" support (like AWT) wich makes it impossible to change the screen resolution. Reducing the screen resolution for rendering is an essential feature for games/high performance applications. Other than performance there are some subtle timing issues involved when rendering to a "fullscreen window" (NEWT) instead of rendering to a "fullscreen exclusive window" (AWTs FEM) when used in conjunction with v-sync based display timing. When using "fullscreen windowed" mode with NEWT the display refresh is "OK" but once every hundred frames there is a small stutter. When using AWT+FEM this stuttering doesn't exist. For a very detailed analysis of the problem take a look here: http://www.virtualdub.org/blog/pivot/entry.php?id=157 tl:dr; version: Rock-solid 60hz v-snyc display in windowed mode is not possible under windows in windowed mode. U have to use fullscreen exclusive mode. ... other than that I can only cite urself: "2010-08-31 [18:46:04] sgothel: @Dom: The active Fullscreen has to come .. sure (Fullscreen with resolution change on NEWT Screen)"
beginning with: https://github.com/sgothel/jogl/commit/fa304942297fcb94c16d8f734570243cf324cb37 ending with: https://github.com/sgothel/jogl/commit/a0e9d6c8382b7275db6fae664be44db6b59671d5