Fps is very poor on AMD cards it seems, I recently purchased a very high end GPU the R9 290 4GB edition.

Affected versions is 14w20b however I have gone back to 1.7 and it seems like it is still the case there. I went back even further to 1.6.4 and it seems like the fps is better but only slightly it's still not what it should be. (you can see screenshots below) - CPU load when taking screenshots was about 20%

I had a gtx 630 before upgrading and I used to get anywhere from 100fps to 300. After upgrading to the R9 290 I am getting anywhere from 15fps to 55fps. I will list my full pc specs below so you can see what my whole system looks like but the fact of the matter is, there is no reason after UPGRADING why I should be getting lower fps...

What I have tried: I attempted to delete the old Nvidia drivers using driver sweeper. Believing that there may have been issues there I decided to just do a fresh install and its the exact same problem, low fps everywhere. I have tried everything from the 13.6 drivers (the initial cd drivers) to the latest 14.6 beta drivers and nothing is changing, same fps throughout.

I know for a fact that the card I have is not defective as I am playing titles like "Thief" "Saints row the Third" "GTA 4" "War Thunder" "Wolfenstein the new order" "Skyrim" All above the 100fps threshold.

Vsync is not on, fps limiter has been tested in every spot it can be in
every single graphical option has been tested and tried in different configurations and nothing is changing. One interesting thing is that prior to getting my new GPU, when I had the GTX 630, enabling the "Super secret settings" and going to the "blobs" or "blobs 2" would cause my fps to go to about 15, now with this new card, the fps doesnt move at all when enabling this, if I stand in one spot and enable it the fps is exactly the same so the card is keeping up it seems like MC is limiting me to very low fps for some reason, with the fps limiter off.

Just to wrap up, I am one of those people that could pretty much tell you instantly when a game drops below 60fps. I see it, I feel it with my input, I see how fast my mouse drags the thing I am controlling and can 100% tell when its not in the 60fps range. I have a server where others have AMD cards and they seem to be getting worse fps than me in the 5fps range, they have lower cards than I but again they are playing brand new titles at 60fps, and is causing them to stop playing mc and on the server.

PC Specs.
CPU fx 8350
RAM 12gb 1600mhz memory
GPU R9 290
MC is running on a samsung 840 evo SSD 120gb.