With Ctrl+G you can toggle between a graphical OpenGL mode and a standard text mode. Even on slower computers it shouldn't be necessary for increasing speed but maybe someone likes the standard letters even more - and so I won't standing in his way. ;)
Per Keys "+" and "-" you can zoom in and out, the bases will become smaller or bigger.

Hint: I think a good zoom for text mode is 150% and 50% for graphical mode. Maybe I will change the program so that these both are standard from the beginning.

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