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PDF Gets bigger and bigger with each new generation

See original GitHub issue

Description

I am generating a pdf from HTML. If I load the page in my browser and SaveAs, all pictures, html, css & js is less than 5MB. However, when I generate a PDF, huge files get generated and they grow in size: 70MB, 90MB, 101MB, 115MB…

Complete minimal example reproducing the issue

Complete means the code snippet can be copied into a unit test method in a fresh C# project and run. Minimal means it is stripped from code not related to reproducing the issue.

E.g.

        [HttpPost("PdfByHtml")]
        public async Task<IActionResult> PdfByHtml(PdfByHtml request)
        {
            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
            var browser = await Puppeteer.LaunchAsync(new LaunchOptions
            {
                Headless = true
            });
            var page = await browser.NewPageAsync();
            await page.EmulateMediaTypeAsync(MediaType.Screen);
            await page.SetContentAsync(request.Html);

            if (request.PdfOptions == null)
            {
                request.PdfOptions = new PdfOptions() { };
            }

            request.PdfOptions.Format = PaperFormat.A4;
            request.PdfOptions.MarginOptions.Bottom = "1.5cm";
            request.PdfOptions.MarginOptions.Top = "1.5cm";
            request.PdfOptions.MarginOptions.Left = "1.5cm";
            request.PdfOptions.MarginOptions.Right = "1.5cm";
            request.PdfOptions.Scale = new decimal(0.8);

            var pdf = File(await page.PdfDataAsync(request.PdfOptions), "application/pdf");
            await browser.CloseAsync();
            return pdf;
        }