is there a way to manage or remove unwanted preview videosnaps from hd?

[Perihelion]

im looking to shrink the size of my preview videos folder.
it is 10gb as of now and id like to see if i can downsize it a bit.
i used mame commander, but it didnt handle videos..

the main reason im asking is:
i am experiencing a huge slowdown in scrolling as soon as a video is playing.
it keeps running for 5 seconds after i navigate (any button, list switch, be it joystick or keyboard)
only after its closed mala responds to my input

naturally i want to see the clip to decide whether to put it into favs or delete it from the list,
but having to wait about 5 secs just to advance in the list is a bit heavy..
and maybe there is another slick way around this

[motoschifo]

My videosnaps folder is 13.3GB but there are more than 5.000 videos (more over 5GB with other 5.000 software list videos) and it's not so heavy to scroll down the list.
The best solution is remove the unwanted files because if you resize them, you will lost quality.
You can delete biggest files (ex. 1GB for file greater than 12MB).