UI Javascript Resource Leak When Reloading Lua

angelo234 · Oct 20, 2021

I noticed recently when I was working on a mod where I would find over time that the UI would become totally unusable and it was driving me crazy! So I wanted to know what was going on and from what I can tell reloading Lua (Ctrl + L) seems to generate new Javascript DOMs but doesn't remove the old DOMs. I found this out by opening the CEF console and seeing that the DOM Nodes, RAM Usage, Event Listeners, Documents, etc. kept growing as I reloaded Lua.

And also because old DOMs aren't removed, they will keep on processing code. For example, I added a console.log function to an "update" function in a UI app to see how quickly the text would get printed and noticed the more I reloaded Lua, the more text would get printed over a time interval.

Here's a video of me generating the resource leak. And at the end I press F5 which seems to release all the unused resources.

If you are wondering how to open the CEF console, execute this Lua command in GE Lua console:
Code:
toggleCEFDevConsole()

_N_S_ · Dec 29, 2021

I really hope this will be fixed someday.
This imposes a restriction on use of intervals.

Camera2004 · Dec 29, 2021

Is this why the game would lag after a while of playing?

Agent_Y · Dec 29, 2021

Camera2004 said: ↑

Is this why the game would lag after a while of playing?
Click to expand...

No this is only when using Ctrl+L, doesn't happen on normal gameplay

_N_S_ · Dec 29, 2021

Agent_Y said: ↑

No this is only when using Ctrl+L, doesn't happen on normal gameplay
Click to expand...

No, not only when using ctrl+L.
This also happens simply when opening the game menu.

Code from video
Code:
    let Random = Math.random().toFixed(1)

    scope.RUN_Invisibility = function () {
        let Invisibility = setInterval( () => {
            console.log(Random)
            if (scope.Invisibility) {
                bngApi.engineLua('be:getPlayerVehicle(0):setMeshAlpha(0, "")');
            } else {
                bngApi.engineLua('be:getPlayerVehicle(0):setMeshAlpha(1, "")');
                clearInterval(Invisibility)
            }
        }, 8)
    };

angelo234 · Dec 29, 2021

Camera2004 said: ↑

Is this why the game would lag after a while of playing?
Click to expand...

This was actually a bug report for the 0.23 version for a specific case and wouldn't happen in general gameplay. Although in the latest version apart from the UI having problems, I've found that repeatedly playing a time trial (probably also applies to regular scenarios) causes the game's FPS to drop and also results in less smooth gameplay overtime and it doesn't seem to have to do with the UI at all.

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UI Javascript Resource Leak When Reloading Lua

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