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Maybe it is a combination of hardsubs and softsubs overlay?
Try to disable subtitle output at thi svideo. Do you see any text at the bottom of the screen?

Это настройки пользовательского профиля SVP, который надо создать и отключить кнопку "Автоматический выбор параметров".
Подробнее см. в инструкции:
https://www.svp-team.com/wiki/Manual:FRC/ru

При воспризведении с SVP надо включить тестовую оранжевую полоску и добиться, чтобы она двигалась без рывков и остановок.
SVP меню Утилиты > Тест плавности воспроизведения.

Влияет скорее всего отрисовщик. Предлагаю использовать MPC Video Renderer

You need to change condition in profile Ignore HFR sources : Video frame rate >= 47 fps
FAQ > I've a 120 Hz monitor and SVP doesn't work for native 60 fps videos

I've a 120 Hz monitor and SVP doesn't work for native 60 fps videos
Interpolating a video with high frame rate can be a very CPU consuming task, because 60->120 fps conversion requires twice as much resource as a 30->120 conversion.

Because of this, SVP has a built-in limiter for the source frame rate to be processed. You can override it:

Switch to Ignore HFR sources profile on the Video profiles page and set the desired frame rate limit value.
SVP before 4.3.192: by using the All settings window, see frc.target.max value.

GPU has several blocks. You can select CUDA or Compute_0 in Windows task manager to know GPU load when RIFE is work.

1. What if try to playback video with mpv player (SVP menu: Open file via mpv...)?
Do you still see 99% GPU usage?

2. Different GPU usage just after start PC and after 20-30 min. It is very strange.

Вопрос был про возможность. Если хочется поэкспериментировать, то возможность есть. Сохранить файл с частотой 120 к/сек, затем прогнать видео например через AviSynth-фильтр ConvertFPS.
http://avisynth.nl/index.php/ConvertFPS#ConvertFPS

If you press button "?" you will get a manual of opts.
preset=slow - hq 2 passes
preset=fast - hp 1 pass

hq - high quality
hp - high preformance

About CPU and GPU load of 50%. Select another block in GPU section if you using TaskManager. You will see 100% load of some of them. For example: CUDA, Compute_0, Compute_1, Video Encode

I've checked with my RTX 3060 Ti.
It has 152 Tensor cores instead of 136 in RTX 4060 Ti.
and it has 38 streaming multi-processors instead of 34 in RTX 4060 Ti.
and it has 4864 cuda cores intead of 4352 in RTX 4060 Ti.

So, my RTX 3060 Ti must be faster than RTX 4060 Ti but it can only do Movie x2 interpolation for 1080p videos in realtime.
Its power is not enough to make 60fps from 24fps for 1080p using RIFE.

I've tested RIFE 4.4, 4.6 and 4.9.

attach whole file override.js please.

1080p x2 works good wirh RTX 3060 Ti. So, I think it must work with RTX 4060 Ti too.
Try Movie x2 option instead of To screen option.