The culprit behind the issue is the video file itself, e.g. the 4k video, which is known to be computer intensive. If you are working with aging hardware, the lagging will happen. You can either update your computer system or convert 4k to a lower-resolution video.
bella0450, please do not post outside links to costly Windows software unless it is directly relevant and on-topic. Nothing personal toward Windows Software, but in this setting; it is often irrelevant and can be easily perceived as Sales Spam. Repeated attempts can lead to account deactivation and removal.
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