If you look for a specific porn actor name on MyVidster, you need to open 6-7 of the same video until you find a functioning one.
Otherwise you just go to the homepage, select "recent" and refresh every minute, looking for nice new stuff. And the alternative is to select "popular" and then you have a list of the videos that are trending at the moment. Since these are recently bookmarked, then they will work at the first try.
And it is vital to have an adblocker. I use the free add-on from Avira, it works wonders.
Sometimes, to open a video, you need to follow the source link, because the embed function sucks.
Oh, and all this applies to laptop. I don't do porn on phone/tablet, too much hassle.