Hi I am lagging during loading screens on my second monitor very clearly streams stutter hard during the loading screens etc. I recently upgraded my pc so maybe that is the issue?
Also in some instances/bgs on Wow Classic TBC I am dropping down to like 40/80 fps and only utilizing like 15% of CPU/10% of gpu.
DXDIAG - https://pastebin.com/BJpv4UdB
BUMP 
This is rather frustrating.
I had a similar problem many years ago:
1.) Find your refresh rate:
Windows Desktop → Right-Click → Show more options → Display Settings → Advanced Display → Refresh Rate
2.) Go into the chat box and set maxFPSLoading and maxFPS to the same value as the refresh rate ( it could be 65Hz, 75Hz, 120Hz, etc )
/console maxFPSLoading "75"
/console maxFPS "75"
/console maxFPSBk "1"
/console targetFPS "30"
Alternate: Edit your Config.wtf to get the same result ( Windows Key + E )
…\World of Warcraft_retail_\WTF\Config.wtf
SET maxFPSLoading "75"
SET maxFPS "75"
SET maxFPSBk "1"
SET targetFPS "30"
NOTE: Even though the human eye cannot perceive more than 20 oscillations per second (Hz), I would be cautious about setting the target FPS to anything under 30 FPS. The main goal is to avoid any in-game frame-rate that is lower than 20-24 FPS:
The Feynman Lectures on Physics, Volume I - Chapter 36. Mechanisms of Seeing - 36–4 The compound (insect) eye
It is also said that the bee can notice flicker up to 200 oscillations per second, while we see it only up to 20.
LINK: https://www.feynmanlectures.caltech.edu/I_36.html
This is not working unfortunately, my monitors also go upto 120 & 165 hz respectively.
All this does is bypass a physical resource limitation / cap with the loading screen. At that point, if there is a hardware limitation it would be more easily noticeable:
NOTE: Your upload speed determines latency, which also influences load times. Latency and read speeds for physical media / HDDs / SSDs, have a bigger influence on the outcome ( sometimes it is raw throughput / bandwidth, which has little to do with latency, but only in the worse case scenario .) Once the game is finished loading, access time for physical media is of little concern ( other than in phased areas / zones / instances. ) This is only once you hit a baseline level of performance found with with most mid-range enterprise-grade HDDs / or entry level SSDs ( I don’t own an SSD btw. )
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