I had been using a Suunto ANT+ stick. I picked up a GARMIN stick and tried it today. My rider lag issue seemed to disappear. Before it was taking 2-3 seconds before my virtual rider would respond with my on the bike effort. Today it was nearly instantaneous…less than half a second. It made a huge difference in drafting and pacing. I was able to ride almost 3 laps with a group of the AIs.
On the downside, I have started seeing a crash upon exit. Doesn’t seem to be anything serious, just the program is not exiting cleanly. Didn’t seem to affect .fit files or anything. It happens whether I hit DISCARD or SAVE but right after I get an error that Zwiftapp stopped working.