I am trying to generate thumbnail file from a large openslide format image(~2Gb), but the resize takes forever to run, not sure if I did it wrongly. Below are my code for trying to generate the thumbnails.

I manage to use vipsthumbnail to generate the thumbnail very fast(instant) and I am using the global libvips.

sharp('test.scn', {limitInputPixels: false})
  .resize(500, 500)
  .png()
  .toFile('output.png')
  .then(info => console.log(info))
  .catch(err => console.log(err))