Hello, I thought I'd follow the commenters recommendations and crosspost on the mailing list after all. When switching to AsyncIOReactor a while back, we discovered that calling .reset() on a delayed call was just a noop when using that reactor. We've since worked around it, but it would be very neat to see this fixed in twisted directly. Exarkun on IRC mentioned that this was a very obvious mistake, but I'm personally not really familiar enough with twisted internals to write a patch for it. The relevant ticket is https://twistedmatrix.com/trac/ticket/9611. - nota