Updated Flash player now get unresponsive performance

I recently updated firefox and adobe flash and also shockwave player. My computer worked fine and played videos and streamed videos with ease. But after one of the updates I can play a single video smoothly or even play a short video. It is so slow and just freezes up to the point where i have to kill down firefox for my computer to unfreeze. The pc works fine in all other aspects , Microsoft office programs work great, any other program works great its just going on the internet and if i go on websites that have flash files or embedded videos like espn.com it just freezes up. Then when i try to play youtube video or a video from a movie/tv show site its unbearably slow. I also tried using microsoft internet explorer, same result, as well as google chrome, yet chrome does load some websites better like the sports website i mentioned earlier. I uninstalled firefox, adobe flash and restarted and reinstalled them all again with latest versions, i usually am an update nut and always keep my programs updated but I dont know what it is that i cant play videos anymore. I have 8GB ram, which it came with 4GB and i purchased an additional 4GB to see if that worked but nope. I mean it looks like my mouse moves quicker but thats about it. I tried defragging my pc and didnt help video issue. I searched around the forums and tried other stuff just can someone try to throw some advice my way or help. I greatly appreciate the knowledge, advice, and help that you all here give. Thanks in advance.

I'm running Samsung NP355E5C

8GB Ram

Windows 8.1

Adobe Flash Player 14,0,0,145 version

Firefox 31.0

Adobe Shockwave 12.1.3r153 version, but rarely works crashes alot, gets error of crashed or Shockwave for Director maybe taking too long or busy etc.