Public bug reported:
GIMP lags to the point of not being of any use, when either the windowed
Single-Window-Mode is being used or the Non-Single-Window-Mode has an image
loaded (the lag occurs only in the main window)
Selecting a menu bar item works fine, also the tooltips for the drawing tools
Same here with Ubuntu 15.10
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 630M/PCIe/SSE2
OpenGL core profile version string: 4.4.0 NVIDIA 352.63
OpenGL core profile shading language version string: 4.40 NVIDIA via Cg compiler
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