OpenGL Canvas or Not

[Enrico Guarnieri]

1st Problem:
After removing the texture buffer option in Git the opengl canvas became
very slow and now it's unusable.

My configuration:

Processor    4x Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz
Memory    8GB
Operating System    Ubuntu 12.04.3 LTS

Display Resolution    1680x1050 pixels
OpenGL Renderer      GeForce 9500 GT/PCIe/SSE2
Graphic Card memory 1024MB
NVIDIA Driver Version 319.32

(Tried with older nvidia cards and a radeon hd 4670 too but with the same
result.)


Kernel    Linux 3.2.0-54-generic (x86_64) Ubuntu SMP
Default C Compiler    GNU C Compiler version 4.6.3

(Tried with the lts-raring stack too but with the same result.)

Desktop Environment tested  Xfce4/Kde4/Gnome3 with/without compositing
active.


2nd problem:
Why the software mode is so slow in rotating and zooming the viewport? In
other painting programs is very fast without gpu acceleration using a
single core too!

3rd Problem:
Why the painting in the viewport is "blurry" in opengl canvas and in
software mode as well? For example Gimp have a very sharp and precise
rendering...
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