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Well that "system load" doesn't seem to be all that accurate because, on my dual-core, the percentage is considerably lower with the likes of 13 threads compared to 5 threads even though the CPU utilization is considerably lower with 5 threads (and resulting SVP performance is still 1.00).

Unless I'm missing something, but I can't think how higher CPU utilization would result in less system load.

Uhhh, I think you have it backwards.  Your issue in question should only happen with hardsubs, not softsubs.

...it is not needed for what I just mentioned seeing how I did not install AviSynth 2.6...

Then what about 3x framerate?  If your issue is what I think it is, then 3x should be considerably smoother than 2.5x even though your display is only 60hz.

Also, just to clarify, your video is in fact 24fps (or 23.976fps), right? (rather than 25fps or 30fps)  You can find out in MPC-HC via File -> Properties, then the "MediaInfo" tab.

OK then, sound like it might be the 24fps -> 60hz stutter issue I had, which is a very different issue.

Before I go digging through my old posts to find what exactly I did to fix the issue, can you first confirm/deny if manually setting 2x interpolation in the active SVP profile causes the issue to go away?  (this would confirm whether your issue is in fact what I am thinking)

I'm going to quote myself regarding the typical things to test first...

If that doesn't work, then it could always be the actual video file itself. Have you tried a different video file?

Some monitors support BFI, particularly those with Nvidia LightBoost (note that this even works with AMD GPUs):
http://www.blurbusters.com/zero-motion-blur/lightboost/

http://www.monitortests.com/forum/Threa … and-NVIDIA

That's why I said Skylake's VP9 decoder is better, but even in Skylake it's still somewhat partial (though I believe it to be more hardware than it is in Broadwell).

Maybe for bootlegs and non-internet based content (outside of 4k via Netflix), but for the majority of legit internet content HEVC has turned into a complete legal mess in the recent months.  It's gotten bad enough that some very big names in the internet video space have created a new alliance for royalty-free video codecs:
http://aomedia.org/

But regardless, YouTube has been serving VP9 videos for the last 18 months, and heck SVPtube even supports it!  Besides, there's no PC GPU that supports VP9 and not HEVC, so you might as well go with one that can do both.

For anyone else reading:

120fps @ 120hz > 60fps @ 60hz > 60fps @ 120hz

The only exception is if your display is not PWM*, in which case 60fps @ 60hz and 60fps @ 120hz should look extremely similar if not identical.

*you might be able to check by making a custom resolution at a low refresh rate, like 30hz - you would see flicker if your display is PWM, otherwise there'd be no flicker at all if your display is not PWM

As someone that uses SVP on 60fps content and interpolates it to 120hz, I can definitely say that there is indeed a benefit.

It needs to be noted however that it's highly recommended that you only double/triple/quadruple by full non-fractional amounts when dealing with natively high framerates; on a display with BFI (black frame insertion), it turns out that non-interpolated 60fps at 60hz was smoother than 60fps interpolated at 90hz with BFI.

One thing to note is that, on a display without BFI, you will actually get improved motion resolution by using SVP - this is in fact what the "120hz" on many TVs do and is also why they do it.

Lastly, even on a display with black frame insertion, there's still quite the benefit due to the fact that using BFI at 60hz can result in quite noticeable flicker, but if you used BFI at 120hz you'd probably have to be born deaf or something in order to see any flickering.

But did you do everything I mentioned in my post?  You weren't too clear on that, and we need to establish that the media player is not at fault before we continue farther.