Preview very choppy even if set at 360p

I tried setting the preview size down to 360p but the preview is choppy exactly as if no down size.
Even if I didn’t apply any filter at all.
My pc:
processor: Intel ® Core ™ i7-5500U CPU @ 2.40GHz
memory (RAM): 16,0 GB
Operating system: 64 bit processor based on x64

From Preview Scaling

However, keep in mind that the source video or images must typically be scaled down to the designed preview scale, and that will have a processing cost.

Really, this was made first mainly to be used in conjunction with proxy editing to eliminate that scaling. So, you need to use proxy to really get an advantage.

Try this

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