MBP 13" i7 Dual Core
I have the same specs, and get around 20-25 fps on low settings.
Try resetting the SMC: http://support.apple.com/kb/HT3964
And try this (I tried, and it works, but I am not sure about the performance boost): https://forum-en.gw2archive.eu/forum/support/mac/Config-File-Edits-for-Improved-Performance
I will keep on trying to improve performance soon, just bought this game but hope I can get it to run better.
Definitely reset the SMC as Wrath already suggested.
As for the tweaks, Anet already turned on the MTD3D= setting which was affecting many people with a recent patch. And, the other tweaks in the above mentioned thread are subjective depending on each person’s build. I personally haven’t seen a difference in performance after changing any of the values in the Config file besides the MTD3D=. On the other hand, I was getting pretty decent fps (25-30) on my 13" MBP before the patch as well.
Regardless, OP, if you plan to try some of the tweaks, don’t forget to make a back up of your Config file before you start playing with it.
The Intel HD Graphics family is just not enough to run this game on a Mac. Sure, it meets the Windows min specs, but running this game through an emulation layer puts even more strain on the system. Dedicated GPUs are the way to go.
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