Framerate feel not consistent with the displayed framerate on high end PC

[HogmanGlenn]

Description

Anywhere between 10min to an hour into playing a game of Dota, the frames begin to feel sluggish. It feels like I'm playing with 40-80 fps despite the frame graph showing 100+. This issue persists until the game is restarted, but I have checked and it does not have any form of memory leak. The issue gets worse if I stream the game on Discord using VP8, H264 or AV1 encoding. Turning off hardware acceleration does not solve or change the issue either. I have no performance issues in other games.

Specs and settings: ROG Strix 4080 Super Ryzen 9 5900x 32gb 3200mhz (Yes, it's running at that speed) Asus TUF GAMING B550-PLUS Installed on a Gen4 PCIe m.2 SSD Windows 11 23H2 Resizable bar ON Hardware accelerated GPU scheduling ON Borderless windowed optimization ON VRR is switched off, as it caused significant audio desync 240hz, 1440p monitor (+ 240hz + 144hz side monitors but these are not displaying the game) Currently using Vulkan, have used dx11

Temperatures during gameplay (Celsius): GPU: 35-45 CPU: 40-45 All other hardware also running at optimal temperatures.

Here is a list of things I've tried (I may not remember everything):

• DDU
• Toggling Resizable bar
• Updating all drivers
• Using old drivers
• DX11 and Vulkan, changing settings. Vulkan makes the issue slightly better, but comes with its own set of issues.
• Capping framerate to 120/144/240 outside of the game (makes for a slightly improved experience)
• Toggled vsync back and forth both in game and in nvidia settings
• Changed nvidia 3D settings, both control panel and Nvidia App
• G-sync on and off
• FidelityFX on and off
• Toggled "Compute shaders" in game
• Toggled Shader pre-caching, as well as background processing of Vulkan shaders in Steam settings
• Set priority to high
• Remove background tasks
• Remove all overlays
• Verified game cache
• Reinstalled game
• Toggled between exclusive fullscreen and borderless windowed
• Extensive logging of ALL hardware performance during games, no anomalies found
• Malware scans
• Registry fixes
• I've ran benchmarks for all components to ensure that they're running at intended speeds
• Launch settings, currently active ones are: -novid -high -vulkan -nod3d9ex -nojoy -novid -map dota -novr

Example Match ID (and possibly Timestamp)

No response

Screenshots

Nvidia app in-game and driver settings (latest drivers, 552.22):

CPU usage per core (first column core0, second to last column core12, last column combined usage):

Framerate presented, framerate displayed, frame time, GPU busy during a Dota game, consistent with average values for the entire game (144fps cap in this example)

[JQINX]

Though I have a low end Pc I also experience this. I believe its because of certain heroes who when use their spells the game smoothness never remains the same as it first loaded. I tested this with 5 Mk ulti in demo and my fps drops from stable 60 to 20 untill mk ulti ends and goes back to 60 and game wasn't smooth at all until i disconnect and rejoin again. I don't experience this with 5 Crystal maiden ulti or 5 enigma ulti or 5 zeus ulti. Same i experience with illusion heroes.