bench.ts

import { jsPDF } from "jspdf";
import Sharp from "sharp";
import fs from "fs";
import fsp from "fs/promises";
import { PDFDocument } from 'pdf-lib';
const testDir = "./test-input"
const testImages = ["landscape-1.jpeg", "landscape-zoomed-1.jpeg", "portrait-bw-1.jpeg"]
async function testPdflib(num:number){
    console.time("pdf-lib-read-3-images-from-fs")

    for (let t = 0; t < num; t+=3) {
        await Promise.all(testImages.map(async (image, idx) => {
            const file = fs.readFileSync(`${testDir}/${image}`, { encoding: 'base64' })
            const doc = await PDFDocument.create();
            const imagee = await doc.embedJpg(file);
            const page = doc.addPage([imagee.width, imagee.height]);


            page.drawImage(imagee, {
                x: 0,
                y: 0,
                width: imagee.width,
                height: imagee.height,
            });
            const pdfBytes = await doc.save();

            await fsp.writeFile(`test-output/output-${t + idx}.pdf`, pdfBytes);
        }))
    }

    console.timeEnd("pdf-lib-read-3-images-from-fs")
}
async function testJspdf(num : number){
    console.time("jspdf-read-3-images-from-fs")
    for (let t = 0; t < num; t+=3) {
        await Promise.all(testImages.map(async (image, idx) => {
            const img = Sharp(`${testDir}/${image}`)
            const file = await (await img.toBuffer()).toString('base64')
            const imgHeight = await img.metadata().then((meta) => meta.height) || 500
            const imgWidth = await img.metadata().then((meta) => meta.width) || 500
            const doc = new jsPDF({
                unit: "px",
                format: [+imgWidth, +imgHeight]
            })
           // image to pdf without changing pdf dimensions
            doc.addImage(file, 'JPG', 0, 0,doc.internal.pageSize.getHeight(), doc.internal.pageSize.getWidth())
            const pdfBytes = doc.output()
            await fsp.writeFile(`test-output/output-${t + idx}.pdf`, pdfBytes);
        }))
    }
    console.timeEnd("jspdf-read-3-images-from-fs")
}
async function main() {

testJspdf(100)
testPdflib(100)

}
main()

output.md

pdf-lib-read-3-images-from-fs: 695.754ms

jspdf-read-3-images-from-fs: 2.687s

time take to produce 100 pdfs