10x-50x performance drop

[paulftw]

When I loft wires created by the drawing API the resulting object is much slower to .cut() with another shape.
Here's a benchmark:

import { cut2D, draw, drawCircle, loft, sketchCircle } from 'replicad'
import replicad from 'replicad'

const R = 1

const H1 = 10
const H2 = 20

export function main() {
  const a = () => drawCircle(R).sketchOnPlane('XZ').extrude(H1)

  const b = () =>
    sketchCircle(R)
      .loftWith([
        sketchCircle(R * 4, { origin: H2 }),
        sketchCircle(R * 4, { origin: H2 * 3 }),
      ])
      .rotate(90, [0, 0, 0], [1, 0, 0])
      .translate([0, -H1, 0])

  const c = () =>
    loft([
      drawCircle(R).sketchOnPlane('XZ', 0).wire,
      drawCircle(R * 4).sketchOnPlane('XZ', H2).wire,
      drawCircle(R * 4).sketchOnPlane('XZ', H2 * 3).wire,
    ]).translate([0, -H1, 0])

  const t1 = []
  const t2 = []
  for (let i = 0; i < 5; i++) {
    let start = Date.now()
    a().fuse(b())
    t1.push(Date.now() - start)

    start = Date.now()
    a().fuse(c())
    t2.push(Date.now() - start)
  }
  console.log(JSON.stringify(t1), JSON.stringify(t2))

  return a().fuse(b())
}

On my machine it printed
[350,210,219,212,218] [9731,8843,9105,8830,8822] (smaller values are better, loftWith values first, then loft([]) drawings).

What could be the reason of it? If this cannot be fixed, how can I avoid introducing these bottlenecks in my programs?