The game is so slow to the point I cannot start a pvp match or start story mode

Development Platform & Builds
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1

The game is so slow to the point I cannot start a pvp match or start the save the world mode it just starts playing the audio without the video PLEASE HELP. The game is Fornite Early access and I have an iMac with processor of 2.7 GHz.
(ps: I am in a Mac computer launching game from unreal launcher)

2

Which game, what Mac?

3

The game is Fortnite early access and it is an iMac with a processor of 2.7 GHz.