Shotcut is slow

I am editing a video that is only 4 minutes long with just 2 video tracks and 2 audio tracks but shotcut is running extremely slow and watching the preview when it reaches to some clips it stops for 2 seconds and then starts again
the video is in 1080x1920 and I have 16 gb of ram, RTX 3050 (laptop) and a Ryzen 7 6800H so I doubt shotcut is too much for my pc.
someone knows how to make it run better?