crossing chunkborders near worldspawn and in proximity to worldspawn in its direction cause severe server lag spikes when using caves and cliffs data pack

[Using caves and cliffs preview data pack] Lag Spike on server when crossing chunk borders near spawn. The further away from the world spawn you go the less it lags. Teleport 5000 blocks away - no lag. When in proximity to the world spawn (5-10) chunks away crossing chunk borders ONLY lags in the direction of the world spawn not the other ones??