This mod alone responsible for 10% fabric server load

[Vetnech]

Perhaps checking every 5 to 20 ticks for minecarts would reduce the load. You could also make the interval configureable. I don't think the checks need to be super accurate as long as chunks load before the minecarts enter them.

[cpagentboot]

An interesting idea. You must have a lot of minecarts. Will look into this.