Question / Help Performance loss when just opening OBS

N

Nilvgaming

Member
I have been trying to figure out what's causing it and today i did some testing with Cinebench R15, and thought the results were kinda interesting.

First i did my baseline score without having any programs running at all except for cinebench:
http://prntscr.com/ihfq1r Score of 1676 with my Ryzen 1700 @ 3.8 ghz

Then only program that i open is OBS and i tested with and without preview being on
With preview being on my score was 1590 (http://prntscr.com/ihfr5q)
And without it being on 1599 (http://prntscr.com/ihfrfu)

All the testing was done without streaming/recording on OBS, and OBS only using around 1,7 - 2,0% of my CPU (http://prntscr.com/ihfrvg)

Personally i don't think this type of performance loss is normal, but maybe someone wiser can explain me if it is. Also would appreciate any suggestions how to improve the situation

@Nilvgaming
 
If you pull up Task Manager and watch the CPU fluctuate when OBS is loaded but not streaming or running you will see OBS CPU Usage of around 2% and GPU usage of around 8% (at least on my system). When preview is turned on and not streaming or recording, CPU sits at 2% but GPU rises to nearly 10%. And, of course as you record or stream, these usage levels fluctuate.

OBS is priming its own pump, while in idle state. A car runs more smoothly when already started than putting in the key and starting it up. Everything syncs better.

Cinebench 15 and OBS Test Takeaways
======================================
- The differences in OBS not running and OBS running with Preview disabled was less than 1% for Cinebench 15 returned results.
- There is a slight loss in FPS when using a 1440p 144Hz Gsync monitor and 1080p 60Hz
- When OBS is running, there is a hit on Cinebench CPU results of roughly 4%

Notes:
- I could have set my 144Hz to 1080p Gsync, but didnt want to screw up my system configuration for this test.
- Returned values for OpenGL fps 1-2% difference in multiple runs
- Returned values for CPU cb were less than 1% difference in multiple runs

Test Scenarios #1 and #2: OBS not running
===========================
Cinebench running on 1440p 144Hz monitor
OpenGL 84.93 fps
CPU 1509 cb

Cinebench running on 1080p 60Hz monitor
OpenGL 83.15 fps
CPU 1512 cb

Test Scenarios #3 and #4: OBS Running 144Hz, Idle state, Preview Disabled
===================================================================
Cinebench running on 1440p 144Hz
OpenGL 81.73 fps
CPU 1450 cb

Cinebench running on 1080p 60Hz
OpenGL 81.58 fps
CPU 1445 cb

Test Scenarios #5 and #6: OBS Running 60Hz, Idle state, Preview Disabled
===================================================================
Cinebench running on 1440p 144Hz
OpenGL 84.19 fps
CPU 1457

Cinebench running on 1080p 60Hz
OpenGL 83.24 fps
CPU 1459 cb
 
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