I had something similar in London. I was not in a pack or riding fast. The avatar would swing to the right wildly.
Herd FriYay Social Group Ride 11:40 pm Jul 23 UTC, Watopia: no swerving, all normal.
Immediately afterwards, I jumped to London for an individual ride, as a test. All riders were swerving.
I think this picture conveys it well. The swerve happens as soon as the front wheel of the rider-behind overlaps the rear wheel of the rider-ahead.
It affects riders doing workouts, for whom drafting is disabled.
This is passing behaviour, rather than drafting behaviour.
Wild swings to outside and unable to swing back into the bunch happening this morning in London
Pretty much unridable in Londonā¦
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Was on the greater London flat this morn, Saturday 24th 7am in Sydney Australia. TBR101. Experienced these issues - Iām on Apple TV but many others commented on these problems. My avatar would pull sideways when another rider got on my wheel, and vice versa. Made it pretty difficult to stick in a bunch and impossible to work with other riders swapping off. Issues were so obvious I donāt know how this could be released, did you somehow put the wrong version into production?? Gin.Woods
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Just did the EVO London 160k ride (currently still running). I jumped off. This is just badā¦Avatars are riding sideways as if they just came out of a (now reopened) pub. You canāt watch the screen without getting sea sick. The whole bunch looks more like a snake going forwards then a rider pack. In regards to draft: something is off here as well. You can do like 1-2 watts/kg more than riders left and right and still wont move up in the bunch (heavy rider here so raw watts not an issue). Zwiftā¦this is badā¦an I mean real bad. Might be time to incorporate some QC and let more or different people beta testā¦the moment you touched the dynamics about a year ago it only got worse from there. I donāt care if riders behave like āirlā after all its a game. But what I do care for is some consistency and more or less predictable behavior of my avatar. This is getting to the point where your āupdatesā cause me to drop of ridesā¦(btw. 13k on Zwift this year alone)ā¦
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How this fails to show up in testing is literally unbelievable.
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Raced today in Yorkshire and weaving happening there and draft was off. How Zwift is doing release testing? If this weaving is not caught internal release testing, it tell quite a lot current status of release testing and software quality control. Please do something about it and quickly.
There can be no way that they test these changes properly before release! Imagine riding along IRL in a group and everyone is just constantly jamming left and right like everyone is in some kind slalom event and then looking at it, recovering from your nausea, and saying āhmm subtle and betterā!!!
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Iām actually convinced there is very little to no testing. Each update introduces so many new issues and there are tons of comments asking about beta test groups and posts like ādont you test these updates?? WTF!!!ā, and I donāt think anyone from Zwift has ever chimed in and disclosed how rigorous their testing is.
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Very similar behavior on Makuri. Just did a large Herd group ride, 260 participants, tons of erratic swerving. As soon as you come up behind someone your avatar goes sharply to the right, then the person you just passed swerves to get in your draft too. Sometimes I would swerve right as someone came up behind me without anyone in front.
This change to pack dynamics is garbage!
Do better Zwift!
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Also suffering with mad swerving effect since latest update. Do these ever get tested before rollout?
Just come off solo ride in London, erratic swerving into middle of road just before overtaking anyone. Same happening to people overtaking me and to others in front.
I was also getting dragged into middle of road at point of being overtaken by solo rider when no others riders around us, so we both ended up in middle of empty road 
I agree that this is a serious annoyance. But my wrath is tempered by the fact that this is just a cartoon world, and I am among the lucky people who have (so far) been spared by plague, fire, flood, famine, war, and anarchyā¦in the real world.
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I was the Yellow Beacon on a group ride Wednesday and a few users did get motion sickness and had to leave the ride. We tried to make the best of it and kidded about virtual barf bags. This was on the Greater London Flats route.
Is there an ETA for the fix? Some of use are changing routes to work around.
Update: Yorkshire, 5am July 25 UTC: swerving behaviour still dominates, with an added feature. Rider B swerves to the right as it starts to pass Rider A; as Rider B is still executing its swerving pass, Rider A starts to also swerve to the right, ending up behind Rider B.
I think this is slightly different from London, where Rider A keeps its line as Rider B passes and swerves.
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Seriously, Zwift, I am Zen about this, but not everyone shares my calm, and you are burning a lot of goodwill.
A rollback to the last stable version is not the worst idea.
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I had this yesterday am UK time on a Solo ride in harrogate. Did it on every overtake of a single rider , violant jerk to the middle of the road just before nearing back of the rider been overtaken
Apple tv / kickr core
The wild weaving is nauseating! I have done 2 training ride, Yesterday it was Grin and Bear It, I donāt remember what I did Thursday but it happened there as well. Please change this!
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Your video epitomizes how annoying a ride is with this app. Thanks for posting.