I haven't tried this mod, but very interest to use it, repairing wall is the #1 reason the bot hoarding the repair packs
(not sure if that still a thing on 0.17, haven't play factorio in years)

Anyway i worry it will have performance issue later on, having hundreds of thousand walls; how does this mod will keep track of them ?

Like i said, i'm an old factorio player that haven't been playing for years.
Back then, a mod that keeping track huge amount of entity will have significant performance drop.
So, i'm worried to use this.
So can yo explained a bit how it will affect performance ?
Sorry is that asking too much.

Also, another question:
Is it safe to remove this mod if there's performance issue later on ?
Will the wall goes missing or just reverting to vanilla wall ?

Hello,

As far as performance goes, the only thing that gets updated is walls that are currently damaged -- it doesn't keep track of all walls, just damaged ones. And even if you have 1000's of damaged walls, the mod limits itself to updating a limited number in order to prevent any UPS impact.

Long story short - you shouldn't have any performance issues!

As for removing the pack afterwards - The walls should revert back to being repairable again.

Thank you for the response, that's very assuring.
Will use this mod 😊