I’m afraid the recommended specs are total bullshit. There is a very long thread on Steam itself about the same thing, my last PC build was better than your specs and it struggled. Now I have an AMD FX6350 at 3.9ghz, 8gb RAM and a Radeon HD6950 1GB and it JUST copes. The performance has improved over the past few patches but I don’t believe you’ll ever get it to run with Intel graphics. As for the Mac user, I’ve read there are a lot more issues with the MAC version but not being one myself, no nothing about them.