**C++ stuff** In order to test the C++ version:
1. The code can be downloaded from [here](https://github.com/IFeelBloated/test_c_filters). 2. I compiled it like: $ g++ -Wall -O3 -shared -fPIC -I. -o libfilter.so GaussBlur.cxx 3\. Create a VapourSynth python filter like test_filter.vpy: import vapoursynth as vs core = vs.get_core() core.std.LoadPlugin(path='./libfilter.so') core.std.SetMaxCPU('none') clip = core.std.BlankClip(format=vs.GRAYS, length=100000, fpsnum=24000, fpsden=1001, keep=True) clip = core.testc.GaussBlur(clip) clip.set_output() Run 4\. Testing: $ vspipe test_filter.vpy /dev/null Output 100000 frames in 29.53 seconds (3386.27 fps) So I am just getting 3386fps with the pure C++ version while I am getting 1200fps with the Nim version. I am not comparing apples to apples here: 1. The Nim version uses int32 while the C++ version uses float. 2. The Nim version is not using getFrameAsync, so it is not taking advantage of multithreading as discussed [here](https://github.com/vapoursynth/vapoursynth/issues/551#issuecomment-610473633).
