Any Tips?

I Play DayZ on very low graphics to stop input lag and FPS drops any tips for better GFX and FPS?

System Info:

Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_gdr.120830-0334)
Language: English (Regional Setting: English)
System Manufacturer: MSI
System Model: MS-7641
BIOS: Default System BIOS
Processor: AMD Athlon(tm) II X2 270 Processor (2 CPUs), ~3.4GHz
Memory: 8192MB RAM
Available OS Memory: 8192MB RAM
Page File: 2232MB used, 14148MB 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: 6.01.7600.16385 32bit Unicode

Display Card:

Card name: AMD Radeon HD 6450
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x6779)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_6779&SUBSYS_23111787&REV_00
Display Memory: 751 MB
Dedicated Memory: 1008 MB
Shared Memory: 3839 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: S22B150
Monitor Id: SAM08A3
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: HD15
Driver Name: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,at icfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64 .dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a. cap,atitmm64.dll
Driver File Version: 8.17.0010.1086 (English)
Driver Version: 8.872.0.0
DDI Version: 10.1
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 7/8/2011 03:28:26, 814592 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71EE2-2439-11CF-0970-1B03BEC2C535}
Vendor ID: 0x1002
Device ID: 0x6779
SubSys ID: 0x23111787
Revision ID: 0x0000
Driver Strong Name: oem2.inf:ATI.Mfg.NTamd64.6.1:ati2mtag_NI:8.872.0.0ci\ven_1002&dev_6779
Rank Of Driver: 00E62001
Video Accel: ModeMPEG2_A ModeMPEG2_C