Need Help With FPS.

Hello people, well I always wanted to record my Gameplay but I always lagg because of my FPS is too low, So anyone know how I can record in good quality with pretty much no lagg? Thank you

Computer Specs:

Operating System
MS Windows 7 Home Premium 64-bit SP1
CPU
AMD Athlon II X2 240 46 °C
Regor 45nm Technology
RAM
4.00 GB Dual-Channel DDR2 @ 401MHz (6-6-6-18)
Motherboard
PEGATRON CORPORATION NARRA5 (Socket AM2 ) 40 °C
Graphics
HP 2009 (1600x900@60Hz)
256MB GeForce 6150SE nForce 430 (HP)
Hard Drives
313GB Western Digital WDC WD32 00AAJS-65M0A SCSI Disk Device (ATA)
Optical Drives
hp CDDVDW TS-H653R SCSI CdRom Device
Audio
Realtek High Definition Audio

I use Game Booster 3 and i Run with 30 FPS while recording. You could also turn down your settings on ca. That would help the lag. If you need Game Booster 3 ill upload it for you. Just send me a PM. @-DTX-