Register_block_style() and performances :'(

I've added some styles for one of my blocks but I have issue with bad performances because of the preview ! Does Anyone know how I could disable this preview ? If I remove this code in block-editor.js it works but this not the good way of doing it:

Object(external_wp_element_["createElement"])("div", {
    className: "block-editor-block-styles__item-preview"
  }, Object(external_wp_element_["createElement"])(block_preview, {
    viewportWidth: 500,
    blocks: previewBlocks
  }))

Please help me ! Thanks