I am having the exactly same problem, here goes some extra information.
As op said, in options is alright ( about 30 fps with built in fps counter )
on characters screem or in game it goes to 8 FPS on LOW and 5 FPS on ULTRA.
Already unchecked origin in game.
I can run BF 3 Fine.
On character screem or in game processor usage goes from 50% to 90% ( its an I-5 )
In game video options shows GRAPHICS API = Direct 3D 11 ( and I cant changes, so I don't think its not using my GPU )
Drivers updated.
Follows my DxDiag:
Time of this report: 6/25/2014, 19:38:52
Machine name: DIEGO-PC
Operating System: Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.140303-2144)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Vostro 3550
BIOS: BIOS Date: 09/30/11 14:13:24 Ver: 04.06.04
Processor: Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 6144MB RAM
Available OS Memory: 6052MB RAM
Page File: 3965MB used, 8134MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
Card name: AMD Radeon 6600M and 6700M Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x6741)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_6741&SUBSYS_04CD1028&REV_00
Display Memory: 3783 MB
Dedicated Memory: 1013 MB
Shared Memory: 2769 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Monitor Genérico PnP
Monitor Model: SAMSUNG
Monitor Id: SAM0A7A
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: HDMI
Driver Name: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver File Version: 8.17.0010.1280 (English)
Driver Version: 14.100.0.0
DDI Version: 11
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 4/17/2014 23:42:54, 1343272 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71EE2-2401-11CF-9876-C724BEC2C535}
Vendor ID: 0x1002
Device ID: 0x6741
SubSys ID: 0x04CD1028
Revision ID: 0x0000