Waldgeist
Avisynth must be in visible filters list in ffdShow. Otherwize SVP can't work with it. So you need for some tuning and customizations.
Thank you for filters list. I see now. What you can do to get smooth playback:
1. Enable HW decoding. Click on LAV video decoder in filter list while playback. What you see in the line 'Active decoder' in Hadrware Acceleration settings?
Select CUVID or DXVA2 (copy-back).
2. Enable D3D FullScreen. You are using renderer EVR (custom presenter). It can show jerks in some cases. To make playback more smoothly go to the MPC menu: Options... - Output - Enable option D3D Fullscreen - OK. Reopen video, switch to fullscreen mode (alt-enter).
"SVP ...slow performance (SVP index: 0.63 - 0.80)" message on the OSD
It is mean CPU load or GPU load are close to 100%. SVP settings are too hard to you configuration.
3. General advise is to reset profiles: SVP - Video profiles... - Reset to defauls - OK - Yes.
4. If problem still here can you look to CPU load value (in SVP Performance Graphs window or in Task Manager) and GPU load (in GPU-Z)?