@Kingdilph,
There is no recording/streaming attempt shown in either of your uploaded logfiles, can you do at least a ~5 minute record/stream test (Doing everything as you would normally in-game) and upload a new logfile please.
- OR -
Is it an issue of just running OBS without recording/streaming? If so, can you provide more detail or your system specs, like Bull3t did. I cannot assist in troubleshooting an issue such as this, other than a suggestion of capping your fps (The best frame rate is the highest stable frame rate you can achieve, without dropping rendered frames) to free up system resources, lowering your graphics settings in-game (AA first, shadows second, lighting third, texture detail fourth) and a suggestion of hardware upgrade: Firstly upgrading your GPU, secondly your CPU.
If you don't already, overclocking your CPU will help greatly in any case, i5 2500k CPU chips were great for overclocking and most could easily hit 4.4-4.5Ghz on air with a Hyper 212 EVO or better.
If it is the latter issue then hopefully someone else can. (I have an i5 2500 non-k, which is now feeling somewhat outdated for recent hardware intensive games when doing local recordings, mainly due to the lack of overclocking ability on a non-k skew, coupled with a r9 290x Tri-X OC) Here are some links to an overview of relative performance for CPU and GPU:
https://www.cpubenchmark.net/cpu_list.php
https://www.videocardbenchmark.net/gpu_list.php
@Bull3t,
Not sure why you would have a frame drop over time, other than maybe a memory leak in-game or temperature throttling of your CPU/GPU? (I don't play Warframe, so could not say)
15% usage of your CPU is perfectly normal for OBS when streaming, could even be higher dependent upon OBS settings.
Your logfile shows conflicting information regarding your streaming output and what you have listed, it states your are streaming at 1080p60fps with a CBR of 6000...
Your logfile shows you have rendering lag issues:
07:50:37.145: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 32745 (12.3%)
Given the fact you play at 1440p144fps you need to either reduce some settings slightly (AA first, shadows second, lighting third, texture detail fourth) or cap your fps to a lower value (The best frame rate is the highest stable frame rate you can achieve, without dropping rendered frames) This will reduce the load on your video card which will alleviate the rendering lag, that being said you have a 1080 Ti so no idea as to why it is having trouble keeping up?
Your logfile also shows some slight issues with network bandwidth issues:
07:50:37.145: Output 'simple_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 1547 (0.6%)
Try slightly reducing the bitrate from 6000 to a lower value, I would drop it by ~250 then check in your logfile after your next streaming session, if still an issue then lower again by another 250.
btw
@Bull3t,
Hello from Adelaide!