Motion blur despite disabled & Screen tearing

[inxomnyaa]

Describe the bug There seems to be some ghosting, tearing and motion blur only* happening in this mod - sadly i get motion sick quickly I have all settings on the highest value, average FPS are 90-120, capped at 150fps. Monitor is 1680x1050 @ 60hz Graphics card is pretty much idling at 25% usage max, 50°C, 2GB VRAM out of 4GB VRAM

*Portal 2 is the only other game where i have noticed the screen tearing, but it is worse in this mod

To Reproduce Steps to reproduce the behavior:

• Disable Motion blur
• Optionally disable Multicore rendering
• Optionally change VSync to disabled
• Optionally restart game
• Optionally change the game resolution
• Optionally change allocated resources and process priority
• Disable overclocking of system components (makes no difference in-game)

Funny enough, i currently can't reproduce the motion blur issue anymore, it was really present in the start though

Expected behavior Motion blur turns off and in-between frames are clear. Moving around or turning the camera gives clear images without tearing

Screenshots

Videos

• Screen tearing w/ disabled but visible motion blur: https://youtu.be/umTa6HXNsoM
• Screen tearing no motion blur happening: https://youtu.be/pfUba0ZpGbk

Youtube's compression pretty much makes recording and showing the motion blur issue impossible

Desktop (please complete the following information):

• OS: Windows 10
• GPU name: GTX 960
• CPU name: i7 875k
• RAM (Quantity + Spec): 16GB 1333 Mhz Full setup: https://pcpartpicker.com/list/TcCtxs

[7rory768]

I have this terrible frame stuttering aswell as shown in the 2nd video all the time, regardless of motion blur being on or off and it feels unplayable. https://youtu.be/pfUba0ZpGbk

OS: Windows 11 GPU name: GTX 3080 OC 10GB CPU name: Ryzen 7 3700X RAM (Quantity + Spec): 16GB DDR4 3600Mz

[inxomnyaa]

Now that i have played through the whole game I want to add that the stuttering and tearing was worse in the first levels, later not noticeable or not happening at all. Maybe the most recent patch changed something?

What i have noticed a lot is that in chambers with gel (& cleansing fields) the framerate can drop intensely (to 2-8fps). This can be forced to happen by tabbing out, or getting the game suspended by other means, but it also randomly happens during play, especially when you go through a portal. A way to get your fps back to normal is to press ESC twice (pause, unpause). The gel also changes appearance between those 2 phases, low-fps always has big blobs, high fps may be many small droplets instead.

This isn't the first Portal mod with this gel issue, i do remember reading some mod's changelog once that had a patch, but i haven't been able to find it yet - might've been Stories Mel, maybe some of you can ask their devs directly?