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I wouldn't tweak vsmlrt unless you know what you are doing. I recommend going back to the original one. Also you might as well try real time to see if you can hit 60fps. If you can't then it's something else you are doing. If you can, then it's your transcoding config.

I made a copy of the Automatic Profile with the slider set to highest performance and started tweaking settings from there. If you hover over each setting, it tells you what it does. If you can't use RIFE then my current SVP settings wont work for you. I recommend running the SVP performance check, making a copy of that Automatic profile and trying each setting to see what difference it makes.

You could also try just running LSFG  on its own with a x2 multiplier to get 48fps which for me was smoother than running at 24fps. LSFG is much lighter on the GPU but it also has the same (or sometimes worse) artifacts as RIFE which is the downside. A discussion with @RickyAstle98 about my SVP settings, RIFE and LSFG are in here:https://www.svp-team.com/forum/viewtopic.php?id=7904. He uses LSFG with SVP Rife which you can't do, but it enables use of a higher fps with RIFE. So maybe you can also use LSFG with just SVP (no RIFE) to get the best overall results.

I also posted some settings in the main RIFE discussion thread which you could also try. But they use nvof and require a pretty decent GPU.

I no longer user RIFE but 4.18 is a good model to use because it has many of the benefits of RIFE without needed a beefy GPU like a 4080. I wouldn't recommend 4.25 for anything less than maybe a 4070.

Yes it can, yes it does, can actually go way beyond that and in 3D too. But maybe SVP is lying to me.

Same here. But I'm not using Rife which is what I've been saying every post for the past week including the one below I posted just yesterday:

You're doing something wrong. But it doesn't matter because it's not an upgrade. 26 Heavy has been out for around a year, this is just a fix for some conversion errors. It is better than before but still has artifacts.

OK I don't know what happened before, but I now have LSFG running very smoothly with slow pans pretty much like RIFE. But also like RIFE, Man of Steel (and I'm guessing other fast vertical motions) cause Artifacts. So I had another play with SVP and this is also now have smooth with slow pans, although maybe not quite as smooth as LSFG/RIFE. But using "Strong" Artifacts masking, Man of Steel and other fast vertical motions do not cause the same artifacts. In fact I struggle to find any artifacts using SVP Pro. But at least now I know that LSFG can match RIFE which is very interesting.

If it's only stuttery on 50 series then it probably doesn't like Win 11 Hardware GPU allocation. What's funny is that  I have other programs that didn't like it with my 40 series but are fine with it on my 50 series. If they fix it then I will give it another try. In the mean time it's either SVP+Rife or more likely just SVP with my new settings. Nice to have the choice

You have to understand that when watching on a very large screen, every small hiccup is seen. Every single one. The settings I posted give me smooth fast motion without artifacts (with the exception Man of Steel) so YMMV.  Both SVP (no Rife) and LSFG  are great for fast action but both need extra configuration to reduce or remove artifacts. SVP (no Rife) for slow pans needs even more advanced configuration. I just realized that I haven't tested LSFG for slow pans yet.

RIFE 26 Heavy is not a new update, just a correction of the existing RIFE 26 Large onnx file. So while SVP+Rife is the best and smoothest for both fast action and slow pans, there are no more RIFE engine updates on the way unless the original author changes his mind. SVP+RIFE is the best but with too many artifacts. That just leaves SVP Pro and LSFG.

So the new 26 Heavy is better than the old 26 Large and is the best RIFE released. It fixes some artifacts cleanly like:
Alita Battle Angel 1:33:26

It improves the Occlusion issues at:
Alita Battle Angle: 1:34:50

But it still struggles with fast vertical motion. The artifacts shown below can be reduced but not fixed by using Image Comparison at 6% just like previous RIFE 25/26 versions. A 4080 can handle this so maybe a 5070ti can too. The last two examples are bad and look very ugly:
Alita Battle Angel 1:34:57
Amazing Spiderman 1:52:49
Man of Steel 1:46:37

I can get almost identical smoothness and less artifacts by using just SVP. With the exception of the PEL override for Quarter Pixel accuracy, the settings I use are a modification of SVP Automatic with the Quality Slider fully moved to the right.  Below are the baseline settings that work well. You can modify them depending on your GPU, but beyond a certain point up or down you may make things worse again so YMMV. 

Edit: Motion Vector Grid 24px works best for the Man of Steel artifacts at the above-mentioned timestamp.

With the scenes I using to test with, I can run 120fps with almost no artifacts. If Rife 27 comes along with even less artifacts then I might switch back to it because the motion is a little smoother and a little clearer. But not by much.

New updated settings in my most recent post as of today

Has the SVP algorithm been improved since RIFE came out? I ask because the basic Automatic Profile with the slider on "Higher Quality" is actually a great starting point. RIFE motion looks a bit more "fluid" but at the cost of some very nasty artifacts. With a little tweaking of SVP Pro, it is possible to get practically artifact free smooth motion with very little GPU resource, especially if you have an good Nvidia GPU. I'm glad I've upgraded but there was really no need. More importantly, I feel a little like I wasted a lot of time trying to reduce RIFE artifacts when I could have just been using SVP by itself.

I fixed Alita which is a movie but LSFG is designed for games. So maybe UI detection detecting  what it thinks are UI in the movie. So I increased it to 10 and Threshold to 1 which works. No more Alita warping.

SVP with Rife v4 still has the smoothest and clearest interpolation I have seen so far. But LSFG is smooth enough at 96fps which is higher than the 80fps I get with SVP. It also has very little affect on GPU, rewinding etc and seems to have far less artifacts.  So this might be my default. Thanks again