This is a realy nice mod. I enjoy just having some drones move around and dont have to think about infrastructure like rails or belts.
But this mod is almost unusable for me. I had only 20 Drones flying around and the time usage of this mod went up to 3.5.. This is just insane. With this slow speed and low inventory space would i have to use hundreds if not thousands of drones just for them to keep up with trains.. and dont forget about all those Moorings.. Im sorry but as the mod currently is, its simply unplayable for me.

Boo, sad to hear

But potentially some good news for you. I've been working on an update that increases performance. I'm currently testing it, but it might take a few days and I make no promises

One of the reasons it is currently slow is because every drone checks each requester which then searches for a provider. Which was the most naïve solution
The update will make it so requesters can list their requests, and available drones will then pick them up. And the scanning is smeared over frames when the load is too heavy. This also allows drones to queue at moorings, meaning that you won't need to spam them anymore which also help with performance

This said; don't expect it to be lag free if you use a fleet. I'm getting around 3ms time-usage at 200 idling drones with the changes, and I don't see that improving. So if you need the throughput of a train, use a train. If you don't need it to travel too far, bots might be a better option. This mod is not intended to replace vanilla transportation
My use-case has been to build and resupply outposts. Plonk down a mooring, provider chest and roboport, and have the entire thing be constructed while I go and do other things

alright

OK, I'm not completely done testing, but I've done a sanity test of the changes. And the performance seem a lot better now. I've also added a setting for Cargo drone's inventory size, which should be able to help with throughput
I won't release it on the portal today, but if you want it early it's available here: https://github.com/Devilhar/factorio-cargo-drones/releases/tag/1.1.0
With a bit of luck it should now be playable for you

Oh, and I found another performance drain for the drones that I hadn't spotted. So on my machine I can now have 400 idling drones with 1.8ms of time-usage
But once they all start moving it goes up to over 6ms, with random spikes of >16ms. So swarms will still be an issue
Mileage may vary

A new day, and a few more tests concluded. It's now on the portal, ready to be updated in game