ohif-viewer/platform/viewer/src/utils/initWebWorkers.js

import cornerstoneWADOImageLoader from 'cornerstone-wado-image-loader';

export default function initWebWorkers() {  
  const config = {
    maxWebWorkers: Math.max(navigator.hardwareConcurrency - 1, 1),
    startWebWorkersOnDemand: true,
    taskConfiguration: {
      decodeTask: {
        initializeCodecsOnStartup: false,
        usePDFJS: false,
        strict: false,
      },
    },
  };

  cornerstoneWADOImageLoader.webWorkerManager.initialize(config);
}