@Grum - If the issue really does boil down to updating LWJGL files, why doesn't Minecraft update them automatically when it updates? We all allow Mojang when our computers ask if Minecraft can make changes to our computers. Also, LWJGL 2.9.0 was released in April 2013, so why didn't MC 1.5.2 already include an updated LWJGL? It makes no sense to us. I'm sorry, but i'm an end user that's just smart enough to understand how to install the LWJGL files, but no one else in my family is. Does that then mean i have to go through three households worth of computers to update the LWJGL so all of us can play Minecraft again? No offense, but that's foolish on Mojang's part. Every other PC game we've ever played has installed ALL necessary files for play, no exceptions. It's inexcusable not to. Thanks, though, i'll get started updating LWJGL for all seventeen computers in our family.
@Meri - Thank you for the wiki link. I'm going to go through and update/test the LWJGL on all the computers.
I'm very pleased with this fix and all players are once again playing Minecraft here. While the fix doesn't bring back previously experienced FPS, we are finally at FPS levels that are playable. No complaints! Thank you very much to Intel for taking the interest and Erik "Grum" Broes for taking the time. It's much appreciated!