What part of my system is holding me back?

I posted my first Youtube video today after recording it with OBS (Open Broadcaster Software) and for the first time i had very noticeable lag during fighting scenes in the game, i am not sure what component is causing the issue as my FPS were displaying 60fps locked during the lagged moments, i stopped the recording and the lag immediately went away during these scenes..

On my keyboard it showed my CPU at 41% during all of the lag and my GPU at 68%, so i am a little confused... If you choose to watch the video, you can see that in some of the action scenes there is noticeable lag in the game recorded.. https://www.youtube.com/watch?v=3URAGxyzZbg

Here is a list of my system, i am kinda curious what part you guys think would hold me back from recording future game episodes, so i can possibly fix or upgrade the situation and continue to record further gameplay.

This Computer
PerformanceTest Information:
PerformanceTest Version: 8.0 (1053) WIN64
PassMark Rating: 1864

System Information:
Operating System: Windows 10 Professional Edition build 10240 (64-bit)
Motherboard Manufacturer: Gigabyte Technology Co., Ltd.
Motherboard Model: Z77-DS3H
Motherboard Version: x.x
BIOS Manufacturer: American Megatrends Inc.
BIOS Version: BIOS Date: 09/19/12 18:20:20 Ver: 04.06.05
BIOS Release Date: 2012/09/19

CPU Information:
Manufacturer: GenuineIntel
Type: Intel Core i5-3570K @ 3.40GHz
Codename: Ivy Bridge
CPUID: Family 6, Model 3A, Stepping 9
Socket: LGA1155
Lithography: 22nm
Number of CPU's: 1
Cores per CPU: 4
Logicals per Core: 1
Clock Frequencies:
Measured Speed: 3403.8 MHz [Turbo: 3804.3 MHz]
Multiplier: 34.0X
Bus Speed: 100.1 MHz
Front Side Bus Speed: (N/A)
Timing Error Ratio: 1.000
Cache per CPU package:
L1 Instruction Cache: 4 x 32 KB
L1 Data Cache: 4 x 32 KB
L2 Cache Size: 4 x 256 KB
L3 Cache: 6 MB

Memory Information:
Total Physical Memory: 16345MB
Available Physical Memory: 10126MB
Memory Devices:
Slot 1: 4GB DDR3 SDRAM PC3-12800
Kingston KHX1600C9D3/4GX, serial#:, wk/yr: 9/2013
XMP: 1.65V, Clk: 800.0MHz, Timings 9-9-9-27

Slot 2: 4GB DDR3 SDRAM PC3-12800
Kingston KHX1600C9D3/4GX, serial#:, wk/yr: 10/2014
XMP: 1.65V, Clk: 800.0MHz, Timings 9-9-9-27

Slot 3: 4GB DDR3 SDRAM PC3-12800
Kingston KHX1600C9D3/4GX, serial#:, wk/yr: 9/2013
XMP: 1.65V, Clk: 800.0MHz, Timings 9-9-9-27

Slot 4: 4GB DDR3 SDRAM PC3-12800
Kingston KHX1600C9D3/4GX, serial#:, wk/yr: 10/2014
XMP: 1.65V, Clk: 800.0MHz, Timings 9-9-9-27

Drive Information:
Physical Drive 1: Samsung SSD 850 EVO 500GB ATA Device
Drive Size: 465GB
Partitions: C:
Interface Type: ATA
Bytes per Sector: 512
RPM: Solid State

Physical Drive 2: OCZ-VERTEX3 ATA Device
Drive Size: 111GB
Partitions: E: F:
Interface Type: ATA
Bytes per Sector: 512
RPM: Solid State

Optical Drive 1: ATAPI iHAS424 B ATA Device

Volume Information:
Volume 1: C: [Local Drive]
File System: NTFS
Drive Cluster Size: 4KB
Volume Size (Free space): 465.7GB (366.9GB)
Volume 2: D: [Optical drive]
File System: UDF
Drive Cluster Size:
Volume Size (Free space):
Volume 3: E: [Local Drive]
File System: NTFS
Drive Cluster Size: 4KB
Volume Size (Free space): 0.1GB (0.1GB)
Volume 4: F: [Local Drive]
File System: NTFS
Drive Cluster Size: 4KB
Volume Size (Free space): 111.7GB (47.9GB)
Volume 5:
File System:
Drive Cluster Size:
Volume Size (Free space):
Volume 6:
File System:
Drive Cluster Size:
Volume Size (Free space):

Video Adapters:
Description: AMD Radeon R9 290 / 390
SLI/Crossfire Enabled: No
Chip Type: AMD Radeon Graphics Processor (0x67B1)
DAC Type: Internal DAC(400MHz)
Memory: 8192MB
Video BIOS: 113-2E3240U-X4A
Driver Provider: Advanced Micro Devices, Inc.
Driver Version: 15.300.1025.1001
Driver Date: 12-4-2015
Monitor 1: 1920x1080x32 60Hz (Primary monitor)
Monitor 2: 1440x900x32 60Hz

Temperatures:
Description: CPU 0 average
Temperature: 40.50C
Description: CPU 0 core 0
Temperature: 38.00C
Description: CPU 0 core 1
Temperature: 39.00C
Description: CPU 0 core 2
Temperature: 40.00C
Description: CPU 0 core 3
Temperature: 40.00C
Description: HDD 1 (OCZ-VERTEX3 ATA Device)
Temperature: 30.00C
Description: GPU 0 (AMD Radeon (TM) R9 390 Series)
Temperature: 47.00C