1.17 huge sync chunk load lag

Since upgrading to 1.17 (paper 68), I have had huge sync chunk load lag. We were always 20 TPS before even with 30 players on, and after the update it is taking up 90%+ (https://timings.aikar.co/?id=ba3fdf30f07e43e48a1dbbc26564bc52).
Other than pregenerating chunks, is there something we are doing wrong?