So I haven't played factorio in nearly about 8 months so I thought I would have a crack at it again and do a new run and do it with some mods to spice it up. Now sense I haven't played in so long I thought I would hop on the tutorial and run through that before I have a try at an actual playthrough. Only there is a strange problem, when robot army is installed when I play the tutorial whenever the objective changes to build a structure such a furnace the performance tanks to 5 FPS when hovering the cursor over any object such as a tree, structure, ore. This only occurs when this mod is installed. I tested for a few minutes in freeplay and this never happened it only happens in the tutorial and only when this mod is active.

Now I fully understand this is a non issue... because who besides me is downloading mods like this then playing the tutorial but I found it so bizarre I just had to share it. In the mean time I just deactivated the mod for the tutorial and will activate it again when I go on to freeplay.

that's a super strange bug for sure, if you could use the Debug screen (F4) and set the time usage and mod/script time usage modes on, and take a screenshot showing the numbers for what could be taking so long?

I can't think of any part of my mod which would induce this kind of lag, I don't have mouse-over events or anything relevant to those contextual things you mention.

Ok, So I replicated it again and turned on a bunch of stuff I thought might be relevant for debug logging but I know nothing about this stuff but here is the screen cap.
https://steamcommunity.com/sharedfiles/filedetails/?id=2592692648

Ok, So I replicated it again and turned on a bunch of stuff I thought might be relevant for debug logging but I know nothing about this stuff but here is the screen cap.
https://steamcommunity.com/sharedfiles/filedetails/?id=2592692648

Edit: I guess I should add I run an i9 and 2080 ti so generally this game runs 60 and never ever dips bellow. I mention just incase that ends up being relevant. Neither my CPU or GPU goes above 5% usage even at that 5fps.

here is another I think I found out how to turn on the script thing.
https://steamcommunity.com/sharedfiles/filedetails/?id=2592701836

You just found a game bug, the level scripting itself is taking 133ms to complete. Robot army shows as taking 0.02ms or whatever small amount. So there's something in the level code which for some reason only gets bad with robot army turned on, but it's the tutorial code at fault.

Please submit your mod list and versions, screenshot, and description of issue to the Factorio forums bug report