[Linux][GeneralsZH 1.0.1] game fps fluctuates between solid 30 and solid 60. Sometimes causes the game time to speed up

[mironsaid]

Prerequisites

• I have searched for similar issues and confirmed this is not a duplicate

Game Version

• Command & Conquer Generals
• Command & Conquer Generals: Zero Hour
• Other (please specify below)

Operating System

• macOS
• Linux
• Other (please specify below)

Bug Description

The FPS sometimes has a hard cap at 30, and sometimes at 60.

If the cap were to suddenly shift from 30 to 60, the gameplay speed increases unrealistically, like the good old days of Windows XP.

This happened to me in a skirmish. On the same session, I saved when the FPS was capped to 30. When I loaded the save, suddenly the game is capped at 60 and the gameplay speed is very fast.

This sometimes also happens randomly while playing.

Reproduction Steps

1. Start a new singleplayer game like skirmish or challenge
2. Save in the middle of the game and then reload the save

Another way:
Have an extended session and randomly get the boost.

Additional Context

No response

[korniychuk]

I also have the same behavior on macOS on the same GeneralsX version.
But I also found that it's reproducible only when we load the saved games directly from the previously original game. If we come back to the main menu and load game from there, it works without speed up, so it works normal.