Question / Help Losing about 50 FPS

[TuxedoInSelva]

Hello,

I lose about 50 fps in any games as soon as I open OBS, this doesn't happen with avconv and ffmpeg in CLI mode.

As of right now I'm on ubuntu 14.04 with fglrx driver, but is the same with radeon opensource driver and amdgpu driver.

Here my specs:

/proc/cpuinfo

processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 30
model name    : Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
stepping    : 5
microcode    : 0x4
cpu MHz        : 2794.000
cache size    : 8192 KB
physical id    : 0
siblings    : 4
core id        : 0
cpu cores    : 4
apicid        : 0
initial apicid    : 0
fpu        : yes
fpu_exception    : yes
cpuid level    : 11
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid
bugs        :
bogomips    : 5595.89
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

processor    : 1
vendor_id    : GenuineIntel
cpu family    : 6
model        : 30
model name    : Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
stepping    : 5
microcode    : 0x4
cpu MHz        : 2794.000
cache size    : 8192 KB
physical id    : 0
siblings    : 4
core id        : 1
cpu cores    : 4
apicid        : 2
initial apicid    : 2
fpu        : yes
fpu_exception    : yes
cpuid level    : 11
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid
bugs        :
bogomips    : 5595.89
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

processor    : 2
vendor_id    : GenuineIntel
cpu family    : 6
model        : 30
model name    : Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
stepping    : 5
microcode    : 0x4
cpu MHz        : 2794.000
cache size    : 8192 KB
physical id    : 0
siblings    : 4
core id        : 2
cpu cores    : 4
apicid        : 4
initial apicid    : 4
fpu        : yes
fpu_exception    : yes
cpuid level    : 11
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid
bugs        :
bogomips    : 5595.89
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

processor    : 3
vendor_id    : GenuineIntel
cpu family    : 6
model        : 30
model name    : Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
stepping    : 5
microcode    : 0x4
cpu MHz        : 2794.000
cache size    : 8192 KB
physical id    : 0
siblings    : 4
core id        : 3
cpu cores    : 4
apicid        : 6
initial apicid    : 6
fpu        : yes
fpu_exception    : yes
cpuid level    : 11
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid
bugs        :
bogomips    : 5595.89
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

VGA

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series]

The system has 16 gigs of ram and the video card has 2. I'm using obs-studio PPA for ubuntu 14.04 as of right now, but when I tested on debian 8 I compiled from source.
As soon as I open OBS, freshly installed with no configuration or sources at-all, I loose about 50 fps in any games, but it's not the case if I stream (to twitch) using ffmpeg CLI or avconv CLI.
I also disabled vblank mode for my card and configured cpu and video card to run at maximum performance with no power savings.
I'm running in dual monitor mode, the vga output is connected to a 1440x960 monitor while the dvi output is connected to an old 1024x768 flat screen. The big monitor doesn't have a dvi port, only vga. I tried both window capture and screen capture with games in full screen, when I run full screen with screen capture I actually go from 100 fps to 8...
Today I'll be upgrading again to 16.04 just to be up-to-date.

Here the log from obs (pardon the pastebin, the text wouldn't fit the post):

http://pastebin.com/skh5CZvC

And again, while using avconv of ffmpeg from CLI I don't loose so much fps...

Thank you for your time and patience and for taking the time to create free software, I could probably upgrade my video card but I feel very frustrated, I bought it last summer, I wonder how we got to the moon with a commodore 64 in the 80s and cannot run a live stream with my specs in 2016...