The lag is a noticeable sticky glitch kind of thing. Seed -7159463857348971439 and the location area (roughly) 449/65/85 - because of the chunk loading glitch in rc1, I had while testing left my render distance at 19 chunks (normally I use 16). When I started seeing the sticky lag spikes I put on F3 and started watching the memory numbers (I'm running 4G allocated to minecraft) and didn't notice anything unusual fwiw.
Comments 3
Thank you for your report!
However, this issue is Invalid.
Performance drops are expected to happen between versions, especially in snapshots. Simply stating that "My game is laggier" is not helpful for Mojang to diagnose your issue. If you can pinpoint a specific cause when lag happens for you, please open a new report for that specific issue. If you think this might be a hardware issue please contact Community Support as they might be able to help with your issue.
Keep in mind that Mojang is constantly optimizing the game and simply playing the game provides feedback to Mojang on which parts cause performance issues. To learn more about this, head here (section "Telemetry") for more information.
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A bit more information as I'm playing (back to 16 chunk render distance). The camera is noticeably jerky when I rotate my view about. Jerky might be a better way to describe the whole experience. 1.18 was smooth as silk.