I'm not sure if this is a bug or not, nor am I sure if the problem was due to this mod, but I think I might be on the right track. I think I had just finished researching Worker robot speed 7 or 8, and then I wanted to speed up the entire game temporarily for something. When I brought the game back to normal speed, it felt like the flying robots were back to a slower speed, possibly 0 (before researching speed 1). I'm currently in the process of researching Worker robot speed 9, but on the Bonuses window, the robots have no speed bonus.

Yes, it's a bug, and my mod is at fault here.

This issue was also reported on GitHub here (currently unresolved). A few related comments have also been made about it here. I haven't looked back at the issue for the past month, but your post prompted me to look into it again. So I quickly hacked together a patch just now in an attempt to fix it. If you want to try and see if this resolves your issue, you can download the patched zip here here.

In the patched version (pre-release) there's an extra setting called Tracking Enabled. If you uncheck it, the mod will behave like it did previously, but with tracking enabled, it should keep all bonuses generated through research or other means.

I hope to hear from you again on whether this helps with your issue or not.

Also, I don't know how familiar you are with the console, but for testing purposes you could update the robot speed with the console command:

/c game.player.force.worker_robots_speed_modifier = 5

To set it to +500% for example, in order to simulate the effect of research.

The console thing is neat. Also, I'm sorry I didn't know about the GitHub thing. As for installing the patched Zip, I've never done that before and I wouldn't know where it goes. I never download mods from my internet browser; I exclusively do my downloading and installing from within Factorio.

Alright, I've added the experimental release of Speed Settings to the mod portal, so you can download it in-game.

For reference, if you're interested in learning how to install mods from .zip, you can get some info on where to put it here. The main page of my mod also has a brief explanation on that.

Also, I'm sorry I didn't know about the GitHub thing.

And don't worry about this, it's all good!

I've been refining the patch for the last couple of days, so I've now added the most recent version on the experimental page.

In the patched version (pre-release) there's an extra setting called Tracking Enabled. If you uncheck it, the mod will behave like it did previously, but with tracking enabled, it should keep all bonuses generated through research or other means.

In the most recent version there's no Tracking Enabled setting, but it instead has an Override Mode. If you leave it unchecked, it should allow the research to accumulate (hopefully fixing your issue). And when you enable it, it forces the settings, thus never allowing the research process or any other source to change the modifiers.

Thanks for the information! When I get home from work tonight, I'll check it out.

The robots in the save file I'm currently playing have a speed bonus of 205%. When I enabled the experimental fork and loaded the save file, the speed bonus was immediately gone, and the bots were super slow again. I quit without saving, disabled the mod, and re-loaded the save again. The same bot that I had seen flying past at a snail's pace was once again moving quickly.

Alright, I've made some changes to the experimental version (now exp-3 or 0.3.0 in the in-game mod manager). Make sure to have Override Mode disabled in the mod settings before loading the save. It should keep the speed bonus intact now.

I'll check it out. Sorry for taking so long to get back here.

I'll check it out. Sorry for taking so long to get back here.

We all got stuff to do, don't worry. Take your time.