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Improve slice browsing performance from 10fps to 90fps

Problem: On Intel i7 computers with NVidia GPUs, slice browsing was very slow (10-15fps).

Analysis: If "Threaded optimization" option in NVidia settings was disabled (by default it is enabled) then frame rate went up to 60fps (limited by vsync) to 89fps (without vsync).

Solution: Force image reslicing & mapping filters to use a single thread. It makes slice browsing fast (60-90fps) without disabling "Threaded optimization".

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