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Then use a custom refresh rate of 48Hz.

24fps --to-> 48Hz is smoother, has less artifacts, and is less computationally demanding than 24fps --to-> 60Hz.

The only thing is that 24fps --to-> 60Hz may feel "faster" however.

Maybe he's always had tearing and the high framerate is just making it more noticable now?

Either way, if you use MadVR, enable "use direct3d 11 for presentation" in the MadVR options.

If you don't use MadVR, enable "D3D Fullscreen" in the MPC-HC "Output" options.

There are actually a few things missing in SVP4 Pro that were in SVP 3 however:

1. Drop every-other frame (useful for livestreams at times)

2. Per-profile scaling

3. Ability to scale to a pre-selected width OR height (rather than both height and width)

But setting up automatic resolution changing in MPV is a complete pain if you aren't into coding or command line stuff, and having your refresh rate be an exact multiple of the original video framerate is an easy way to improve smoothness and reduce artifacts.

I know you didn't actually say it in your text, but in the image you highlight the resizer being set to "Bilinear".

I think it's safe to say that, if someone is trying to play 2160p videos that they can take the minor increase in CPU utilization that comes from using Bicubic specifically for downscaling.

You don't have to, it's just that the other settings really don't work that well for anime (you'll get weird artifacts).

There's no real "best settings" specific to anime other than the shader really. However, there are several other things that are useful to set regardless of video content, and since performance is an issue, this should help.

First, let's make sure you've kept the following settings that I've mentioned previously:

In SVP, enable GPU acceleration if you haven't already.  Also it would probably be wise to set the processing threads in SVP to 7.

In LAVfilters (particularly the one that is built into MPC-HC), set the decoder to "DXVA2 (copy-back)"

In MPC-HC, set your output to "Enhanced Video Renderer (custom presenter)"

In MPC-HC, set your resizer to one of the three "Bicubic" options (A=-0.60 is the smoothest, A=-1.00 is the sharpest)

In MPC-HC, enable "D3D Fullscreen"

Now set your SVP profile settings to

Frames interpolation mode: 1.5m OR Uniform (1.5 = fewer artifacts; Uniform = smoother but more CPU heavy)
SVP shader: Sharp
Target frame rate: Double source frame rate (2x)
Motion vectors grid: 8 px. Small 0
Search radius: Average
Motion vectors precision: Half pixel
Decrease grid step: Disabled
Wide search: Strongest
Artifacts masking: Disabled
Processing of scene changes: Blend adjacent frames
Decrease frame size: To screen size

Now it's very likely that this will give you performance that is not at all adequate.  So from there, you need to decrease some of the settings.  Normally you'd work with 4 of the settings, but for anime content you really only need to focus on 2 of them:

Motion vectors grid
Motion vectors precision

"Grid" controls the overall feeling of "speed" of all on-screen motion, while "Precision" only applies to the smoothness of small movements.  Generally you want to reduce "Precision" as low as possible (that being to "Two pixels") before trying to reduce the "Grid" setting.  Simply keep reducing those setting until you end up with good performance.

However, sometimes a combination such as "14 px. Average 1" + "One pixel" will give a better result than something like "12 px. Average 2" + "Two pixels".  Also remember that setting 'Interpolation mode' to "Uniform" will give higher CPU utilization than if you set it to "1.5m".

Once you have your SVP settings how you like them, there is one thing left we can do to improve smoothness of overall video-playback without increasing CPU utilization or artifacting, but it's not quite as easy to set up, so I'd rather get your SVP performance woes out of the way first.

To clarify, SVP can expose instability that can cause a BSoD.  When I was still figuring out a stable undervolt, I found that SVP was actually more intensive than the likes of prime95.

(I've since then discovered something even more intensive, but that's off-topic)

Make sure you re-enable GPU acceleration in both LAVfilters and in SVP.

Also, it would be wise to change the resizer in MPC-HC (on the same screen as "D3D Fullscreen") to one of the "Bicubic" algorithms (of the 3 bicubic options, 0.60 the softest while 1.00 is the sharpest).

OK then, try setting your LAVfilters decoder to "None".

If that doesn't fix it, try setting 'GPU acceleration' in SVP to "No acceleration".

(these are both sub-optimal settings, but the goal is to try to figure out the cause and then figure out a solution)

Nvidia + Windows 10 = this

Go into MPC-HC's internal LAVfilters and set your hardware decoder to DXVA2 (copy-back).

You also may or may not need to enable "D3D Fullscreen" in MPC-HC or alternatively enable "use direct3d 11 for presentation" in MadVR.

Right click the SVP icon in the bottom-right of your screen, hover over "video profiles", and then select whichever video profile you want (the bolded one is the most recent or currently used profile).