Worthwhile to get a high speed sd card?

[Liggerstuxin]

Well my questions been asked a thousand times I'm sure.

Is it woth it to get a fast sd card? Mine seems to be slow with a certain video streaming app. I realize the streaming will be the same, but will the menu be faster when loading the video titles and such?

Is there any reason that it would be slower than before? Like if it slowly gets corrupted?

Hopefully this post won't be removed now that I didn't mention the illegal streaming app that I use...