Long Arma 3 startup delays in Steam as it re-downloads all mods

[rwwiggins 10]

When I start up Arma 3 in Steam (that is, fire up the Arma 3 launcher) it appears to download every subscribed add-on/mod from the workshop.  For large mods like CUPS, Bornholm, etc this can be up to a 30 minute delay!  Shouldn't it just verify your local mod content and then only download new or missing content?  Is anyone else having this problem?  Is there a setting I don't have configured properly? The obvious work-around is to load the large add-ons manually, but long-term that seems to defeat the whole purpose of the workshop framework.

[HeroesandvillainsOS 1504]

I can't believe this hasn't been fixed yet.

It's happened to me twice and I had a ticket open on the OLD feedback tracker.

Yeah, it's been around for a long time now and it's absolutely awful when it bites you.

[ineptaphid 6413]

Happened to me as well. You may have to manually unsubscribe from all workshop items.For me it was 1200 things...

[dmarkwick 261]

I don't have any mods from Steam - they're all manually added. But I still experience a 15-20 second delay while the launcher checks it all out. Launching ArmA before this check is complete results in a vanilla bootup of ArmA, no mods at all. I wonder if some option can be worked in that can disable the check?