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...so basically the default except for "Frames interpolation mode @ Uniform", "Artifact masking @ Weakest", and "Wide search @ Strongest".

99% of 120Hz TVs do not accept a 120Hz signal but rather do frame interpolation up to 120fps much like SVP does.

There's a reason that "Complicated" isn't the default setting.

The trick is that the higher the resolution and the higher the source framerate, the less artifacting you get with "Complicated". Also note that content with a lot of thin lines is like kryptonite for "Complicated" and you should very much use "Standard" instead.

In other words, 480p 24fps content at 60Hz is probably one of the worse use-cases for "Complicated".  By comparison, using "Complicated" with 1080p 60fps content at 120Hz works much much better.

This was just the easiest way to replicate the bug.

Just for reference, how much RAM do you have?

No.

Is the SVP performance with 48Hz worse, better, or about equal to 60Hz?

EDIT: Also, could you make note of what the CPU utilization looks like?  After playing a video through SVP, open SVP and go to the "Performance monitor" graphs, click the "Overall" text link so that it shows usage for all 4 CPU cores, take a screenshot of the window (alt+printscreen), open MS Paint, Paste, save the image as a PNG, and upload it to your post as an attachment.

...and it's now 5am here.  I'm going to sleep.

Indeed, you had a different issue because OP isn't even using MadVR as far as I can tell.

And that's it? O_o

Well, uh, as a test, select 40Hz and apply it, then try playing back your video.

EDIT: If it happens to run at full speed with 40Hz, don't keep it that way; that'd be a really sub-optimal setting - there's a better way to do things (which is what I've been planning on explaining).

EDIT 2: Also, when using 40Hz but just sitting at the desktop, does your screen look flickery?

First off, what is the resolution of the video, the frame rate of the video, the resolution of your display, and the refresh rate of your display?

Also, it would be useful to know if your display lets you select any refresh rate other than 60 or 59 without the use of custom resolutions.

And yes, try running the "assess system performance" test again.

EDIT:
It's 4am here, so I must go to sleep.  If anyone else is willing to step in while I'm sleeping, my idea is to run the display at a refresh rate that is exactly 2x of the source framerate.  If the necessary refresh rate isn't available, I was going to suggest using CRU to make a custom resolution (using the timing standard "LCD reduced") with the according refresh rate, and then using MPC-HC's automatic resolution switcher to automatically switch to said refresh rate for content of that framerate.

For reference, on my own HP DM1 laptop with an AMD E-350, I've used CRU to create a 48Hz custom refresh rate for the integrated display which MPC-HC automatically switches to for 24fps videos, so I was just going to explain how to replicate this functionality.

EDIT 2: Well, before that, I was going to make sure that, if the video is 1080p and the display is something like 768p, that SVP was set to downsize the video to the size of the screen.

Ok, now I'm going to sleep.

I just realized something!

I said I was using 3x and the graph above assumed that 72 fps was real-time... but I'm using 3x with a 30 fps video, so in this case real-time needs to be 90 fps!

For reference, I run the following refresh rates for the following source video frame rates:

90Hz = 30 fps
96Hz = 24, 48 fps
100Hz = 20, 25, 50 fps
120Hz = 60 fps

...you do realize that "Auto" threads gives different amounts of threads on different CPUs, right?  Auto will give you more threads on a 4-thread CPU than it will on a 2-thread CPU.

I have reason to believe that, on my 2-thread CPU, Auto gives you 5 threads, so therefore it would be very likely that both of your CPUs are given at least 7 threads when using "Auto".  Considering the jump in performance that can be gotten by using 7 threads, it's no surprise that you are not seeing the performance bottleneck that I am seeing with "Auto".

I made a post about customizing SVP's settings a few months back.  It may be exactly what you're looking for:

If you need more performance, leave all the custom settings at their default except for the following 4 options:

• Motion vectors precision

• Motion vectors grid

• SVP Shader

• SVP interpolation mode

Start with the first setting ("Motion vectors precision") by decreasing its value by 1 step (to "One pixel") and then testing your SVP performance.  If that's not enough, decrease it by another step again (to "Two pixels") and re-test your performance.  If it's still not enough then keep it at "Two pixels" and move onto the setting listed next on the list - "Motion vectors grid".

Do this process of decreasing the value and then, if necessary, moving to the next setting in the list above and then decreasing it's value as well etc etc until you get full performance.

The only exception is that you may want to manually set the SVP shader to "Sharp (anime)" for traditional non-CGI animated content.

For really low-end systems (read: 10 year old dual-core PCs without GPU acceleration), you need to mix and match the settings to get optimal smoothness, like using 1m + standard + 16px rather than adaptive + sharp + 28px (the latter being what SVP's automatic options would use (relevant thread).

I should have clarified, the 1.5m error has been fixed in recent updates - no need waiting for the supposed "big update".