I'm not googling and pasting links for you. I found two instances in about two minutes when i initially checked some forum threads returned by google.
I'm terribly sorry, but if you make a claim and someone asks for evidence of said claim, the usual response in a discussion is "Oh, certainly, I understand that I made a claim and I should be able to back up said claim with evidence". I was able to find an example of a review site unable to get over 40 FPS with the HD4000 in MineCraft. I assume this was not with OptiFine, but I also assume it was not with FTB as well. I was not able to find anyone able to get 60FPS or more in standard MineCraft with the Intel HD4000. And as you can see, we have someone stating that yes, you are not going to get even 40 FPS with optifine in vanilla.