Premier CC takes 10 second to play time line... Every time I stop

Hello,

I started a project last week and was working on it fine until a day ago when I came into my studio and booted the project up only to find that every time I pressed the play on my time line it took 10 second to start playing. Once it plays it plays the footage is fine no lag with the sound  and no glitchyness but once I pause and play again it takes another 10 seconds to start playing again. I am editing with MXF files on an apple but the footages is 2k and like I said it was running fine all last week.

I have since un-installed premier and re-installed it twice, cleared my cache from premier and off my desktop, cleared space off my hard drive, tried different hard drives, updated my computer, I have even started new projects with .mov files that run fine on my desktop but once imported into premier take 10 seconds to play. Even just an adjustment layer take 10 sends to start playing, its pretty ridiculous.

I just bought the program and Installed it onto this computer 2 weeks ago.

Please help me this is extremely frustrating.

Thanks

Im am working on:

Mac tower 2014 OS, Version 10.12.3

3.7GHz quad Core Intel Xeon E5 processor

12gb Ram

AMD Fire Pro D300 2048 MB Graphic Card