All GoldSrc games performance regression since the 20th aniversary update.

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Your system information

• Steam client version (build number or date): 1763795278
• Distribution (e.g. Ubuntu): Fedora 43 Workstation
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]
• GPU: AMD Radeon RX 7800 XT
• CPU: AMD Ryzen 7 5700x3D

Please describe your issue in as much detail as possible:

BugReport.webm

Before the 20th aniversary update CS 1.6 could achieve 1000 fps. Now that's not possible somehow.
As for Half-Life 1 turning on the flashlight can in select locations heavily drop the FPS way below vsync, I don't think that was the case.

Steps for reproducing this issue:

1. Go to the following spot in half-life 1.
2. Turn on the flashlight.
3. FPS drops to 63 fps(165 hz screen, kills frame pacing).

[0Ky]

I believe this issue is related to #3614 and #1848.