Use Eleventy Image concurrency with Image Transform method

eleventy.config.js

// Using the command: DEBUG=Eleventy:Image* npx @11ty/eleventy
// will report the concurrency value used.

import eleventyImage, { eleventyImageTransformPlugin } from "@11ty/eleventy-img";

eleventyImage.concurrency = 1;

export default async function (eleventyConfig) {
	eleventyConfig.addPlugin(eleventyImageTransformPlugin, {
		// …
	});
};