EEex Uncap FPS Causes Severe System-Wide Lag and Input Delay

[sendoa]

First of all, thank you so much for developing EEex. It’s truly amazing and has made me enjoy these games like never before.

When I enable uncap FPS and load a game, after a few seconds or minutes of play, everything becomes extremely slow, with terrible lag. The mouse cursor moves normally, but clicks and actions have a lag of several seconds. Even if I close the game, the system (Windows 11) remains in the same state. I have no choice but to restart the PC.

I have a PC with an Nvidia RTX 4080 graphics card and a G-Sync monitor. I’m using version 2.6.6.0 of BGEE.

Thanks you!

WeiDU.log

000000001-Quick-Save-4.zip

[Maltodaxtrin]

I have a similar problem with FPS uncapped but only when outside the game.

In-game everything is fine but when I alt-tab out, the system slows down massively. I can't even scroll down a browser's web page. When I alt-tab back in the game everything is fine again. Alt-tab out, lag again, etc. Rinse and repeat.

[sendoa]

It seems to happen when the game is in windowed mode. I've been playing in full-screen mode and it seems to work fine, although that prevents me from using BG2RadarOverlay.

[Maltodaxtrin]

I am on fullscreen and have the problem outlined above. In-game works fine, but while alt-tabbing it's painfully slow to do anything

[Bubb13]

Thanks for the report. Some questions:

1. What refresh rate is your monitor?
2. What FPS do you have EEex's limiter set to?
3. Is VSync enabled?

I'm aware of a particular bug with the FPS uncap code and am working on a fix. The bug sounds similar to yours; refresh rates around 60hz can cause the FPS uncap to delay game logic, resulting in "laggy" gameplay but smooth rendering. A temporary fix for that one is setting EEex's FPS limit slightly lower than the monitor's refresh rate - maybe that will work for you too?

As for alt-tabbing, I suppose I can build in a render throttle for when the game window is unfocused so it doesn't consume a ton of resources when you're doing something else.

[Maltodaxtrin]

Maybe when alt-tabbing the game forgets the 144 fps limit and uncaps it? Or forgets about vsync or something? Which would slowdown the PC a lot, hugging all available resources.

Just a theory I am throwing out there lol.

Anyway, I'm not sure if the 3 questions were for me or sendoa, but whatever, gonna answer them regardless. Disregard them if useless:

1. 144 hz gsync
2. 144 fps
3. Yes

Thanks!

[4Luke4]

@Bubb13

For what it's worth, the same stutter occurs if you enable the native Windows option Dynamically adjust your monitor's refresh rate to save battery...

[sendoa]

Thanks for the report. Some questions:

1. What refresh rate is your monitor?
2. What FPS do you have EEex's limiter set to?
3. Is VSync enabled?

I'm aware of a particular bug with the FPS uncap code and am working on a fix. The bug sounds similar to yours; refresh rates around 60hz can cause the FPS uncap to delay game logic, resulting in "laggy" gameplay but smooth rendering. A temporary fix for that one is setting EEex's FPS limit slightly lower than the monitor's refresh rate - maybe that will work for you too?

As for alt-tabbing, I suppose I can build in a render throttle for when the game window is unfocused so it doesn't consume a ton of resources when you're doing something else.

1. 165Hz
2. 144Hz
3. Yes

Thank you!